Colour-Changing COB LED Strip — RGB, RGBW & RGBCCT

This collection covers 24V RGBW COB strip lights with dot-free spotless output, CRI90+ on the white channel, and cut to length at marked intervals as standard. All products ship from UK stock in Telford, Shropshire with free delivery and a 5-year warranty. Call 01952 370028 for specification advice.

RGBW 4-in-1 COB · CRI90+ white channel · 24V DC · Dot-free output · cut to length at marked intervals at any point · 5-year warranty · Free UK delivery · 01952 370028

Quick decision summary

• You need colour effects AND clean white from one strip: RGBW COB strip is the only option that delivers both without compromise — standard RGB cannot produce usable white.
• You need white light only with no colour changing: Choose single colour 24V COB strip instead — simpler wiring, lower cost, same CRI90+ quality.
• You need individual LED control and chase effects: Choose addressable digital RGB COB strip — pixel-level control per segment.
• You need runs over 20 metres in a single colour: Choose 48V single colour COB strip for maximum run length with minimal voltage drop.

Who is this page for?

• Interior designers and lighting consultants specifying colour-tuneable lighting for hospitality, residential feature walls, or retail displays where both colour effects and high-quality white light are required in the same installation.
• Electrical contractors looking for a reliable 24V RGBW COB strip with clear wiring guidance, correct driver and controller pairing, and UK technical support available during the 2026 specification season.
• Experienced DIY installers upgrading from basic RGB strip and wanting to understand why RGBW produces better white light, how to wire it, and which controller to pair with it.

Who is this page NOT for?

• Buyers who only need static white light: You will pay more for RGBW when single colour dot-free COB strip does the same job at a lower cost with simpler wiring.
• Anyone planning to use a dimmable driver: RGBW COB strip requires a non-dimmable constant voltage driver paired with a dedicated RGBW controller. Using a dimmable driver causes flicker, colour shift, and premature failure.
• Buyers needing individually addressable pixel effects: RGBW strip operates all LEDs in unison per zone — for per-pixel chase and flow effects, addressable digital RGB strip is the correct product.

Common buying mistakes to avoid

• Buying a dimmable driver for RGBW: This is the most common error. RGBW strip needs a non-dimmable constant voltage 24V driver connected to a separate RGBW controller. The controller handles all dimming and colour mixing — a dimmable driver interferes with the control signal and causes visible flicker.
• Expecting clean white from standard RGB strip: RGB mixes red, green, and blue light to approximate white. The result is a cold, violet-tinged wash that looks noticeably different from genuine white LEDs. Only RGBW with its dedicated white chip solves this.
• Mounting RGBW strip directly on bare metal: The exposed copper tracks on the strip underside will short-circuit against uninsulated conductive surfaces — always mount on an insulating surface or inside an aluminium LED profile with proper seating.
• Testing strip while coiled on the reel: Heat builds rapidly in coiled strip, destroying adhesive and creating a fire risk. Always uncoil fully before powering.

On this page

1. What is RGBW COB strip and why does it outperform standard RGB?
2. Why does standard RGB strip fail to produce clean white light?
3. What specifications should you check when choosing RGBW COB strip?
4. Which driver and controller pairing does RGBW COB strip need?
5. How do you wire and install RGBW COB strip correctly?
6. Where is RGBW COB strip most commonly used in 2026?
7. Can RGBW COB strip replace separate white and colour circuits?
8. How does RGBW COB compare to RGBW SMD strip?
9. What IP rating do you need for RGBW COB strip?
10. How do you control colour and white temperature on RGBW strip?
11. Why choose ATOM LED for RGBW COB strip lights?
12. Frequently asked questions about RGBW COB strip 24V

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What is RGBW COB strip and why does it outperform standard RGB?

RGBW COB strip combines red, green, blue, and a dedicated white LED chip in a single dot-free strip using Chip-on-Board technology. Unlike standard RGB strip, which blends three colour channels to approximate white and produces a cold violet-tinged result, RGBW uses a separate CRI90+ white chip that delivers genuine warm, natural, or cool white alongside full colour-mixing capability.

The core difference is the fourth channel. Standard RGB strip has three colour channels — red, green, and blue. When all three fire at maximum, the physics of additive colour mixing should theoretically produce white. In practice, it produces a harsh, slightly purple-tinted wash that no professional lighting designer would specify for a kitchen, bedroom, or retail environment. The dedicated white channel in RGBW bypasses this entirely with a purpose-built white LED that delivers accurate colour rendering at CRI90+.

COB construction adds the second advantage. Traditional RGBW strip uses individually packaged SMD LEDs — typically 5050-size four-in-one chips — soldered at intervals of 30 to 60 per metre. Each diode is visible as a distinct bright dot, particularly at close range or through shallow diffusers. RGBW COB strip mounts all four colour chips directly onto the PCB under a continuous phosphor layer, producing completely dot-free output. The result is a smooth, unbroken line of colour-changing light with no visible hotspots.

• Dedicated white chip: CRI90+ white output that matches the quality of single-colour white COB strip, rather than the violet-tinged approximation produced by RGB mixing.
• Dot-free COB output: No visible individual LEDs — smooth continuous light even without a frosted diffuser, suitable for exposed architectural installations.
• 4-in-1 chip architecture: Red, green, blue, and white all sit on the same chip package, maintaining consistent colour blending across the entire strip length.
• 24V DC operation: Compatible with the widest range of constant voltage drivers and RGBW controllers available in the UK in 2026.

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Why does standard RGB strip fail to produce clean white light?

Standard RGB strip creates white by firing red, green, and blue LEDs simultaneously at full intensity. In theory, this additive mixing should produce white, but LED phosphor chemistry means each channel's peak wavelength does not blend into a uniform white spectrum. The result is a cold, violet-tinged wash with poor colour rendering, typically measuring below CRI70 — far below the CRI90+ minimum that professional installations require in 2026.

The issue is not brightness — RGB strip at full white output can be plenty bright. The problem is spectral quality. Natural white light contains a continuous spread of wavelengths across the visible spectrum. RGB white is made from three narrow spikes at approximately 625nm (red), 525nm (green), and 465nm (blue). Objects illuminated under this spiked spectrum look washed out, with reds appearing dull and skin tones looking unnatural.

White light characteristic	Standard RGB white	RGBW dedicated white
How white is produced	Mixing R+G+B at full output	Dedicated white LED chip
Colour rendering index (CRI)	Typically below CRI70	CRI90+ on ATOM LED range
Visual appearance	Cold violet-purple tinge	Clean warm, natural, or cool white
Skin tone accuracy	Unnatural — greenish or purple cast	Accurate — suitable for hospitality and retail
Power consumption at white	All three channels at maximum — high draw	White channel only — lower consumption
Suitable for task lighting	No — poor colour accuracy	Yes — meets CRI90+ specification
Suitable for ambient mood	Yes — colour effects only	Yes — colour effects plus genuine white

This is why RGBW exists as a product category. If you only need colour effects — bar backlighting, entertainment lighting, accent colour washes — standard RGB is adequate. But the moment you need that same strip to produce functional white light for a kitchen worktop, a bathroom mirror surround, or a hotel room cove, RGB falls short. RGBW with its dedicated white chip gives you both capabilities from a single strip without compromise.

• CRI below 70 on RGB white: Colours under RGB white appear faded and inaccurate, making it unsuitable for any space where you need to see true colours — cooking, applying makeup, retail product display.
• Higher power draw for worse white: Producing white on RGB requires all three channels running at maximum output, drawing more power than a single dedicated white channel while producing lower quality light.
• RGBW efficiency advantage: When using white mode, only the white channel draws power, typically consuming 40–60% less energy than RGB attempting the same perceived brightness in white.

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What specifications should you check when choosing RGBW COB strip?

The five specifications that matter most when selecting RGBW COB strip are white channel CRI, LED density per metre, total wattage per metre, colour consistency across the reel, and whether the strip uses genuine 4-in-1 RGBW chips or separate RGB and white LEDs on the same PCB. ATOM LED RGBW COB strip uses 4-in-1 architecture with CRI90+ white and dot-free output as standard across the 2026 range.

Not all RGBW strip is built equally. Some manufacturers save cost by placing separate RGB and white SMD LEDs side by side on the same PCB. This creates uneven colour blending — you can see distinct colour zones between the RGB and white chips, particularly at close range. True 4-in-1 RGBW COB integrates all four colours into each chip package, producing consistent blended output at every point along the strip.

• White channel CRI: Look for CRI90+ minimum. Any RGBW strip advertising CRI80 on the white channel is using a lower-specification phosphor — acceptable for accent lighting only, not for kitchens, bathrooms, or retail in 2026.
• LED density: Higher density means smoother colour gradients and better blending. ATOM LED RGBW COB strip uses high-density chip placement that eliminates visible dots entirely.
• Wattage per metre: Higher wattage means brighter output but also more heat. Ensure your chosen 24V LED driver has at least 20% headroom above the total strip wattage.
• 4-in-1 chip vs separate LEDs: Insist on 4-in-1 RGBW chips for even blending. Separate RGB and white LEDs create visible colour banding, particularly in shallow profiles.
• Operating voltage: 24V is the standard for RGBW COB strip in the UK, offering the best balance of run length, driver availability, and controller compatibility.
• cut to length at marked intervals capability: ATOM LED cut to length at marked intervals allows cutting at any point without voiding the 5-year warranty — essential for bespoke lengths in profiles and architectural details.

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Which driver and controller pairing does RGBW COB strip need?

RGBW COB strip requires two separate components: a non-dimmable 24V constant voltage driver to supply power, and a dedicated RGBW controller to manage colour mixing, dimming, and white channel operation. Never use a dimmable driver — it conflicts with the controller's PWM signal and causes flicker, colour shift, and premature component failure. The controller handles all dimming functions independently.

This is the most critical technical point on this page and the source of the most common installation failure. Standard single-colour LED strip uses a dimmable driver paired with a wall dimmer. RGBW strip works fundamentally differently. The driver provides a constant, steady 24V DC supply. The RGBW controller then sits between the driver and the strip, rapidly switching each colour channel on and off (pulse width modulation) to create the desired colour mix and brightness level.

Component	Correct for RGBW	Incorrect — do NOT use
Power supply	Non-dimmable 24V constant voltage driver	Dimmable 24V driver (TRIAC, 0-10V, DALI)
Dimming/colour control	Dedicated RGBW controller with 4-channel output	Standard single-channel wall dimmer
User interface	RF remote, WiFi app, DMX, or touch panel via controller	Rotary wall dimmer or trailing-edge dimmer
Signal type	PWM from controller to strip	Phase-cut from dimmable driver
Result if incorrect pairing used	N/A	Visible flicker, colour drift, shortened LED life

When sizing the driver, calculate total strip wattage (length in metres multiplied by wattage per metre) and add a minimum 20% headroom. A 10-metre run of 14W/m RGBW COB strip draws 140W — you need a driver rated at 168W minimum, so a 200W unit is the practical choice. Browse the full range of LED power supplies to find the correct wattage.

For the controller, ATOM LED stocks options from three leading brands, each suited to different project requirements in 2026:

• MiBoxer RGBW controllers: WiFi and RF control with smartphone app integration — popular for residential and small commercial projects where simple app-based control is preferred.
• Skydance RGBW controllers: Professional-grade with DMX512 input, DALI compatibility, and push-dim options — suited to commercial and architectural installations requiring integration with building management systems.
• Ltech RGBW controllers: High-specification units with 4-channel independent control, multiple protocol support, and precise PWM frequency adjustment for flicker-free operation on camera.

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How do you wire and install RGBW COB strip correctly?

RGBW COB strip installation follows a five-wire system: one common positive (+24V) and four negatives (red, green, blue, white). The driver connects to mains power and outputs 24V DC to the RGBW controller. The controller then connects to the strip via five-core cable, with each colour channel independently wired. Always use parallel wiring for multiple strip segments and never power strip while coiled on the reel.

Before starting any installation, gather all components and confirm compatibility. The installation steps below apply to all ATOM LED 24V RGBW COB strip products.

1. Step 1 — Plan the layout and measure precisely: Measure each strip run to the exact millimetre. With cut to length at marked intervals, you can cut ATOM LED RGBW COB strip at any point without voiding the warranty, but measure twice before cutting. Mark the mounting surface where each strip segment will sit, noting feed points and controller locations. Allow space for the driver and controller in a ventilated, accessible position.
2. Step 2 — Size and install the driver: Calculate total wattage by multiplying strip length by watts per metre. Add 20% headroom and select a non-dimmable 24V constant voltage driver. Mount the driver in a ventilated location — not inside a sealed void without airflow. Connect mains input according to the driver's terminal markings (L, N, Earth) and leave the 24V output disconnected until the full circuit is complete.
3. Step 3 — Mount and connect the RGBW controller: Position the controller between the driver and the strip. Connect the driver's 24V DC output to the controller's power input terminals (V+ and V-). The controller's output side has five terminals — V+, R, G, B, W — corresponding to the strip's five wires. Ensure the controller's total wattage rating exceeds your strip's combined draw.
4. Step 4 — Prepare the mounting surface: Clean the surface thoroughly with isopropyl alcohol. If mounting on metal, apply an insulating barrier first — electrical tape or a plastic mounting channel — to prevent the strip's exposed copper tracks from short-circuiting against the conductive surface. For best results, mount inside an aluminium LED strip profile which provides heat dissipation, physical protection, and a diffuser option.
5. Step 5 — Mount the strip and make connections: Peel the adhesive backing and press the strip firmly into position. For runs requiring joins, use five-pin RGBW connectors or solder each wire individually — ensuring R to R, G to G, B to B, W to W, and V+ to V+. If running multiple segments from one controller, wire them in parallel back to the controller output, never in series.
6. Step 6 — Test before final fixing: With all connections made, uncoil any remaining strip fully and power on. Test each colour channel individually using the controller — red only, green only, blue only, white only — then test colour combinations and white modes. Check for any flickering, dead segments, or colour inconsistency. If flicker occurs, verify you are using a non-dimmable driver. If one channel fails, check the corresponding wire connection at each joint.
7. Step 7 — Secure cables, set scenes, and commission: Tidy all wiring with cable clips or trunking. Programme your preferred colour scenes, white temperature presets, and dimming levels into the controller. Label the driver and controller clearly for future maintenance. The full installation typically takes 2 to 4 hours depending on run length and complexity.

For installations requiring outdoor-rated RGBW strip, check the IP rating section below. Indoor dry locations require IP20 minimum. Bathrooms and sheltered outdoor areas typically require IP67. Contact the ATOM LED technical team on 01952 370028 for project-specific advice.

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Where is RGBW COB strip most commonly used in 2026?

RGBW COB strip is most commonly specified for residential living areas, hotel room coves, restaurant and bar feature lighting, retail display cases, and home cinema rooms where the installation requires both atmospheric colour effects and functional white task lighting from a single strip circuit. The dot-free COB output makes it particularly popular for exposed and semi-recessed applications where SMD dots would be visible.

The dual-function capability is what drives specification. Rather than installing separate white and colour circuits — doubling the strip, drivers, controllers, and wiring — RGBW provides both from one strip. This saves material cost, installation time, and reduces the number of components that could fail over a 5-year lifespan.

• Kitchen islands and worktop coves: White mode at CRI90+ for food preparation during the day, then colour accent mode for evening entertaining — all from one strip installed under the counter edge or inside a profile.
• Hotel and hospitality room lighting: Warm white for general use, colour accents for mood scenes controlled via bedside touch panel or app — a growing specification in UK boutique hotel fit-outs during 2026.
• Living room feature walls and ceiling coves: The most popular residential application, where RGBW strip in a recessed silicone LED profile provides clean architectural uplighting in white and the option to switch to colour for film nights or parties.
• Retail display and visual merchandising: White mode at CRI90+ shows product colours accurately during trading hours, while colour modes support seasonal displays, window features, and brand-colour highlighting.
• Bars, restaurants, and nightlife venues: Colour scenes during service hours, white for cleaning and prep — one strip circuit serves both operational needs.
• Home cinema and media rooms: Bias lighting behind screens in adjustable colour temperatures reduces eye strain during viewing, while colour effects add atmosphere for social viewing.

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Can RGBW COB strip replace separate white and colour circuits?

Yes — RGBW COB strip replaces the need for two separate strip installations in most applications. Instead of running one single-colour white strip for task lighting and a second RGB strip for colour effects, RGBW combines both functions into a single strip with one driver and one controller. This reduces component count, halves wiring complexity, and cuts installation time by approximately 30 to 40 percent compared to dual-circuit configurations.

The practical benefit on site is significant. A dual-circuit installation for a 6-metre kitchen cove requires two 6-metre strip lengths, two drivers, two controllers, two sets of wiring runs, and two separate control interfaces. With RGBW, you install one 6-metre strip, one driver, one RGBW controller, and one set of five-core cable. The single RGBW controller lets you switch between white and colour from one remote or app.

• Component reduction: One strip replaces two — fewer potential failure points and a cleaner installation behind the cove or profile.
• Wiring simplification: Five-core cable to one strip versus two separate three-core runs to two strips — less cable, fewer terminations, lower labour cost.
• Single controller interface: One app or remote controls both white and colour modes, rather than juggling two separate control systems.
• Cost saving: While RGBW strip costs more per metre than single-colour white, the total project cost is typically lower than buying and installing two separate strip types with their respective drivers and controllers.

The one scenario where RGBW does not fully replace separate circuits is when you need the white channel and colour channels running simultaneously at maximum output — for example, white task lighting on one section while colour accent runs on an adjacent section. In that case, separate circuits give independent control. For most residential and commercial installations, however, RGBW delivers the flexibility needed from a single circuit.

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How does RGBW COB compare to RGBW SMD strip?

RGBW COB strip produces completely dot-free light output by mounting LED chips under a continuous phosphor layer, while RGBW SMD strip uses individually packaged 5050-size LEDs at fixed intervals that are visible as distinct bright dots. COB offers superior colour blending, smoother gradients, and a more uniform light line — making it the preferred specification for exposed, architectural, and profile-mounted installations where individual LEDs would be visible.

Both types use the same RGBW four-channel colour mixing principle and both require the same driver and controller setup. The difference is entirely in the light output quality and visual appearance.

Feature	RGBW COB strip	RGBW SMD strip (5050)
Light uniformity	Continuous dot-free line	Visible individual LED dots
Colour blending	Smooth gradients across the strip	Colour spots visible at close range
Typical LED density	High — continuous chip placement	30–60 LEDs per metre typical
Flexibility of strip	Higher — thinner PCB profile	Moderate — thicker due to component height
Best for exposed mounting	Yes — no dots visible	No — requires heavy frosted diffuser
White channel CRI (ATOM LED)	CRI90+	Varies — CRI80 to CRI90
Price per metre (typical UK 2026)	Higher	Lower
Profile compatibility	Fits standard aluminium profiles	Fits standard aluminium profiles

If your RGBW strip will be concealed behind a heavy frosted diffuser or recessed behind a cornice where the strip itself is never directly visible, SMD strip can work acceptably. But for any installation where the strip is visible — inside a clear-cover aluminium profile, mounted on an open shelf edge, or fitted into a shallow cove — COB is the better specification in 2026. The dot-free output is particularly noticeable when running colour gradients and transitions, where SMD strip shows individual dots cycling through colours in sequence rather than presenting a smooth blend.

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What IP rating do you need for RGBW COB strip?

For dry indoor locations such as living rooms, bedrooms, and kitchens, IP20 RGBW COB strip is sufficient. For bathrooms (zones 1 and 2 under BS7671) and sheltered outdoor applications, IP67 rated strip is the minimum safe specification. For fully exposed outdoor installations, water features, or locations subject to direct water contact, IP68 is required. IP65 is not suitable for UK outdoor conditions or bathroom wet zones despite being widely sold for these applications.

IP ratings for LED strip follow the same two-digit system used across all electrical equipment. The first digit indicates solid particle protection, the second indicates water protection. For RGBW COB strip installations, the water protection rating is the critical factor.

• IP20 — dry indoor only: No water protection. Suitable for living rooms, bedrooms, kitchens (away from direct splash zones), home cinemas, retail display cases, and any enclosed dry environment.
• IP65 — surface splash only: Protects against water jets from any direction. However, IP65 is not sufficient for UK outdoor conditions where prolonged rain, standing water, and freeze-thaw cycles are common. IP65 should not be specified for UK outdoor use or bathroom wet zones under BS7671.
• IP67 — temporary immersion: Suitable for bathrooms (zones 1 and 2), sheltered outdoor installations under eaves or canopies, garden lighting in covered areas, and locations with occasional water contact. Browse outdoor-rated COB strip for IP67 and IP68 options.
• IP68 — continuous submersion: Required for ponds, water features, fountains, fully exposed outdoor installations, and any location where the strip may be submerged or continuously exposed to water.

When specifying RGBW COB strip for outdoor use, remember that the controller and driver must also be appropriately rated or housed in a weatherproof enclosure. A common error is installing IP67 strip outdoors while leaving the controller exposed to rain in an unsealed junction box. Contact the ATOM LED technical team on 01952 370028 or email operations@atomled.co.uk for project-specific IP rating guidance.

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How do you control colour and white temperature on RGBW strip?

RGBW strip colour and white control is managed entirely by the RGBW controller, not by the driver. The controller independently adjusts the intensity of each of the four channels — red, green, blue, and white — using pulse width modulation (PWM). This allows selection of any colour in the RGB spectrum, adjustment of white colour temperature from warm to cool, dimming of overall brightness, and programming of timed scenes and transitions through a remote, app, or hardwired wall panel.

The choice of controller determines the user experience. A basic RF remote offers preset colours and manual white adjustment. A WiFi-enabled controller adds smartphone app control, timer scheduling, and voice assistant integration. A DMX controller provides frame-accurate synchronised control across dozens of strips in commercial and entertainment venues.

• RF remote control: Handheld remote communicates wirelessly with the controller — typically offering 8 to 20 preset colour modes, manual RGBW mixing, brightness dimming, and basic on/off timer functions. No internet connection required.
• WiFi and app control: Controller connects to local WiFi network, allowing control via smartphone app from anywhere in the building. Most apps support scene programming, colour wheel selection, music sync, and group control of multiple zones. MiBoxer WiFi RGBW controllers are one of the most popular choices for residential UK installations in 2026.
• DMX512 control: Professional protocol used in commercial, hospitality, and entertainment lighting. Allows precise channel-level control of hundreds of RGBW strips from a central desk or automation system. Skydance controllers and Ltech units support DMX input alongside simpler RF and push-dim fallback modes.
• Wall-mounted touch panels: Hardwired panels that replace a standard light switch position, offering direct colour and brightness control without needing a phone or remote. Well suited to hotel rooms and commercial spaces where guests should not need an app.

One frequently overlooked detail: the PWM frequency of the controller affects flicker visibility. For domestic use, frequencies above 1,000Hz are sufficient. For video production, photography studios, or any space where cameras operate, specify a controller with a PWM frequency above 3,000Hz to avoid visible flicker on recorded footage. Check controller specifications or call 01952 370028 for advice on flicker-free options.

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Why specify ATOM LED for colour-changing COB strip?

ATOM LED stocks RGB, RGBW (3000K and 4000K), and RGBCCT COB strip at CRI90+ from UK warehouse in Telford with a 5-year warranty on all DC voltage COB products. All four variants available in IP20, IP67, and IP68. Every reel ships cut to your specification at marked intervals with free UK delivery. Our technical team on 01952 370028 provides controller-pairing guidance and driver-sizing calculations at no charge, Monday to Friday, 9am to 5pm.

ATOM LED supplies RGBW COB strip direct from UK stock in Telford, Shropshire — not dropshipped from overseas warehouses. Every RGBW COB strip carries a 5-year warranty, CRI90+ white channel as standard, and cut to length at marked intervals that allows cutting at any point without voiding the warranty. Free UK delivery, a dedicated technical team on 01952 370028, and product specifications verified by our own testing make ATOM LED one of the most technically focused LED strip suppliers in the UK.

• UK stock, not dropshipped: Your RGBW COB strip ships from our Telford warehouse, typically arriving within 1 to 3 working days. No 3-week waits from overseas suppliers and no customs delays.
• 5-year warranty on all DC voltage COB strip: Covers manufacturing defects and LED degradation within the warranty period — one of the longest standard warranty terms in the UK LED strip market in 2026.
• CRI90+ white channel as standard: Not an upgrade or premium option — every RGBW COB strip in the ATOM LED range includes CRI90+ on the dedicated white chip.
• cut to length at marked intervals at any point: Cut to the exact millimetre your installation requires. The warranty remains valid regardless of cut position — a feature most competitors do not offer on their RGBW products.
• Technical team available Mon–Fri 9am–5pm: Call 01952 370028 or email operations@atomled.co.uk for driver sizing, controller selection, wiring layouts, and project-specific advice from staff who understand these products because they test and install them.
• Free UK delivery: No minimum order value for free delivery across mainland UK — the total you see is the total you pay.
• Trusted by contractors and designers: Rated 4.64 out of 5 from over 580 verified reviews across the ATOM LED product range.

Cut to your specification: specify the run length and we cut at the correct 50mm interval before dispatch. Colour-changing projects often need precise lengths for feature walls and bar counters — no mid-run connectors means no colour inconsistency at the join. All four variants (RGB, RGBW 3000K, RGBW 4000K, RGBCCT) stocked in IP20, IP67, and IP68.

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Frequently asked questions about RGBW COB strip 24V

1. What is the difference between RGB and RGBW COB strip?

• RGB has three channels (red, green, blue) and attempts to create white by mixing all three — the result is a cold, violet-tinged wash with poor colour rendering below CRI70.
• RGBW adds a fourth dedicated white channel with a purpose-built white LED chip rated CRI90+ on the ATOM LED range, producing genuine warm, natural, or cool white alongside full colour capability.
• For any installation requiring usable white light, RGBW is the correct choice — RGB white is not suitable for task lighting, kitchens, or any application where accurate colour rendering matters.

2. Can I use a dimmable driver with RGBW COB strip?

• No — RGBW strip must use a non-dimmable constant voltage driver. All dimming is handled by the RGBW controller via PWM, not by the driver.
• Using a dimmable driver causes flicker, colour shift across channels, and premature failure of both the driver and the strip LEDs.
• The controller replaces the dimmer entirely — it controls brightness, colour mixing, and white temperature independently for each channel.

3. How far can I run RGBW COB strip on a single feed at 24V?

• Maximum single-feed run for 24V RGBW COB strip is typically up to 5 metres per strip segment, depending on wattage per metre and colour mode in use.
• For longer installations, use parallel wiring back to the controller output — connect each strip segment independently rather than daisy-chaining in series.
• Series wiring multiplies voltage drop across each segment, causing the far strips to appear dimmer and show colour inconsistency.

4. What controller do I need for RGBW COB strip?

• You need a dedicated 4-channel RGBW controller — not a 3-channel RGB controller and not a standard single-colour dimmer.
• Check the controller's total wattage rating exceeds your strip's combined draw — if your strip draws 140W total, the controller must be rated above 140W.
• ATOM LED stocks RGBW controllers from MiBoxer, Skydance, and Ltech — browse the full LED controllers range or call 01952 370028 for advice on the right unit for your project.

5. Does RGBW COB strip produce dot-free light?

• Yes — COB (Chip-on-Board) technology mounts all LED chips under a continuous phosphor layer, producing completely dot-free, spotless light output.
• This differs from RGBW SMD strip where individual 5050 LEDs are visible as distinct bright dots, particularly at close range or through shallow diffusers.
• Dot-free output makes RGBW COB ideal for exposed installations, clear-cover profiles, and any application where the strip is directly visible.

6. Can RGBW COB strip be cut to custom lengths?

• ATOM LED RGBW COB strip features cut to length at marked intervals — trim at the marked cut points to match your installation length precisely.
• The 5-year warranty remains valid regardless of where the strip is cut, which is not standard across the industry.
• Standard RGBW strip from other suppliers typically restricts cuts to marked solder pads every 33mm to 100mm, creating wastage on bespoke installations.

7. Is RGBW COB strip suitable for bathrooms?

• Yes, provided you use the correct IP rating. Bathrooms require IP67 minimum for zones 1 and 2 under BS7671 wiring regulations.
• IP65 is not sufficient for bathroom wet zones — it protects against surface splashes only, not the sustained moisture exposure typical in UK bathrooms.
• The driver and controller must also be either IP-rated for the installation zone or mounted outside the bathroom in a ventilated location with only the strip running into the wet zone.

8. How do I wire multiple RGBW strip segments?

• Always use parallel wiring. Each strip segment connects independently back to the controller output terminals (V+, R, G, B, W) via its own five-core cable run.
• Never wire in series — connecting one strip's output to the next strip's input multiplies voltage drop and creates uneven brightness and colour inconsistency across segments.
• Use five-pin RGBW connectors or solder joints at each connection point, matching each wire colour precisely (R to R, G to G, B to B, W to W, V+ to V+).

9. What wattage driver do I need for RGBW COB strip?

• Calculate total strip wattage: multiply the length in metres by the wattage per metre rating (e.g., 8 metres at 14W/m = 112W).
• Add a minimum 20% headroom: 112W strip load requires a driver rated at 134W minimum — a 150W unit is the practical choice.
• Browse LED transformers and drivers to find non-dimmable 24V constant voltage units in the correct wattage for your project.

10. Can I use RGBW COB strip outdoors?

• Yes, with the correct IP rating. Sheltered outdoor locations (under eaves, canopies, covered pergolas) require IP67 minimum.
• Fully exposed outdoor installations — garden borders, facades, water features — require IP68 rated strip.
• IP65 is not suitable for typical UK outdoor conditions where prolonged rain, frost, and standing water are common throughout autumn and winter.

11. Does RGBW strip work with voice assistants like Alexa and Google Home?

• Yes, when paired with a WiFi-enabled RGBW controller. MiBoxer WiFi controllers integrate with Alexa and Google Home via the Tuya or MiBoxer app platform.
• Voice control allows on/off, brightness adjustment, colour selection, and scene activation through spoken commands.
• Hardwired DMX systems do not support voice control directly — they require a separate smart home bridge or integration hub for voice assistant compatibility.

12. Why does my RGBW strip flicker when dimmed?

• The most common cause is using a dimmable driver instead of a non-dimmable constant voltage driver. RGBW strip dimming must be controlled by the RGBW controller, not by the driver.
• The second most common cause is a loose connection on one of the five wires between the controller and the strip — check all terminals and solder joints.
• If flicker persists with correct wiring, check the controller's PWM frequency — frequencies below 500Hz can cause visible flicker in peripheral vision, particularly at low brightness levels.

13. What is the CRI rating of the white channel on ATOM LED RGBW COB strip?

• CRI90+ across all ATOM LED RGBW COB strip products. This means illuminated colours appear within 90% accuracy of how they look under natural daylight.
• CRI90+ is the minimum professional specification for kitchens, retail, hospitality, and any environment where accurate colour rendering is required.
• Standard RGB white output (without a dedicated white chip) typically falls below CRI70, making it unsuitable for task lighting or colour-critical applications.

14. Should I mount RGBW COB strip in an aluminium profile?

• An aluminium profile is recommended for all RGBW COB strip installations. The profile acts as a heatsink, extending LED lifespan by drawing heat away from the PCB.
• Profiles also protect the strip physically — preventing accidental damage during cleaning or furniture movement — and provide a clean, finished appearance.
• For RGBW specifically, a frosted diffuser cover on the profile helps blend the four colour channels more smoothly at very close viewing distances. Browse aluminium LED profiles and silicone LED profiles for options compatible with COB strip.

15. Can I connect RGBW COB strip to a standard light switch?

• A standard on/off light switch can control the mains supply to the driver, which powers the entire RGBW circuit on and off — but it provides no dimming or colour control.
• For dimming and colour control, you must use the RGBW controller — operated via remote, app, wall panel, or DMX depending on your chosen controller type.
• Some Ltech and Skydance RGBW controllers include a push-dim function that works with a momentary retractive switch in place of a standard toggle, providing basic on/off and dimming from a wall position.

16. How do I avoid colour inconsistency between RGBW strip reels?

• Order all strip for a single project from the same batch. LED colour binning means slight variations can occur between manufacturing batches — same-batch strip ensures consistency.
• ATOM LED stocks full reels from consistent production runs, and the technical team can confirm batch matching when you order. Call 01952 370028 or email operations@atomled.co.uk before placing large multi-reel orders.
• If mixing reels is unavoidable, position different-batch strips in separate zones rather than adjacent runs where any colour difference would be directly visible.

Browse the full RGBW COB strip 24V collection · Call 01952 370028 · Email operations@atomled.co.uk · Free UK delivery on 97% of products · Shop RGBW controllers · Shop LED drivers · Shop COB strip accessories

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Do you offer colour-changing COB strip in made-to-measure lengths?

ATOM LED cuts RGB, RGBW, and RGBCCT COB strip at the nearest 50mm marked interval to your specified length. Colour-changing strip has a wider PCB (12mm vs 8–10mm on single colour) because it carries multiple LED channels, but the cut intervals remain consistent along the reel. Order a 7.2m restaurant bar run and it arrives as a single 7.2m piece. No extra charge and no minimum length — the same service applies to a 0.5m sample as to a 15m installation. All available in IP20, IP67, and IP68.

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Related Collections

• LED strip lights
• RGBW LED controllers
• 24V non-dimmable drivers
• addressable digital RGB COB strip
• aluminium strip profiles
• RGB neon flex
• RGBW installation and wiring guide

Last reviewed: March 2026 — ATOM LED technical team, Telford, Shropshire. Specifications current as of 2026.

🏭 UK LED specialist, Telford, Shropshire  ·  ☎️ 01952 370028  ·  🚚 Free UK delivery on 97% of products