Power Supply

Choosing the wrong LED power supply is the most common reason installations fail within 12 months. An undersized driver overheats, an oversized one wastes energy, and a mismatched IP rating corrodes internally the moment moisture reaches the PCB. This page covers everything you need to size, select, and install the right constant voltage power supply for any LED strip or neon flex project in 2026.

ATOM LED stocks constant voltage LED power supplies from 20W to 600W across 24V and 48V outputs, including IP20 indoor, IP67 outdoor, and TRIAC dimmable options. Every unit ships from UK stock with free delivery, backed by our technical team on 01952 370028.

Constant Voltage 24V & 48V · 20W–600W · IP20 Indoor · IP67 Outdoor · TRIAC Dimmable · Mean Well & HiLED · Free UK Delivery · 01952 370028

On this page:

1. What does an LED power supply actually do?
2. How do you size an LED power supply correctly?
3. What is the difference between constant voltage and constant current?
4. Which IP rating does your LED power supply need?
5. Do you need a dimmable or non-dimmable power supply?
6. 24V vs 48V LED power supply — which voltage should you choose?
7. What wattage LED power supply do I need for common strip lengths?
8. How do you wire an LED power supply safely?
9. What are the most common LED power supply mistakes?
10. How long should a quality LED power supply last?
11. Mean Well vs budget LED power supplies — does brand matter?
12. Frequently asked questions about LED power supplies

Quick decision summary:

• Indoor kitchen or living room strip lighting: Use an IP20 constant voltage driver matched to your strip voltage (24V or 48V) with a 20% wattage headroom.
• Outdoor garden, patio, or decking: Use an IP67 constant voltage driver to withstand UK weather conditions year-round.
• Dimmable single-colour installation: Use a TRIAC dimmable LED driver paired with a trailing-edge dimmer switch.
• RGB or RGBW colour-changing strip: Use a non-dimmable constant voltage driver with a dedicated RGB controller — never a dimmable driver.

Who this page is for: Homeowners planning LED strip installations, electricians specifying drivers for clients, interior designers selecting power supplies for kitchen, bathroom, or commercial fit-outs, and anyone replacing a failed or undersized LED transformer.

Who this page is NOT for: If you already know you need a specific voltage driver, go directly to our 24V LED driver or 48V LED driver pages. If you need a mains-dimmable unit specifically, see our TRIAC dimmable driver range.

Common buying mistakes to avoid:

• Sizing to exact wattage: Running a driver at 100% load generates excessive heat and shortens lifespan by approximately 40% compared to running at 80% load.
• Using a dimmable driver with RGB or RGBW strip: This causes flicker, colour shift, and premature component failure — RGB and RGBW strips require a non-dimmable constant voltage driver paired with a dedicated controller.
• Fitting an IP20 driver in a bathroom or outdoor location: IP20 offers zero moisture protection and will corrode internally within weeks in damp environments.
• Choosing a leading-edge dimmer with a dimmable driver: Leading-edge dimmers frequently cause visible flicker with LED drivers — use a trailing-edge dimmer, which typically costs approximately £15.

What does an LED power supply actually do?

An LED power supply converts 230V AC mains electricity to low-voltage DC output (typically 24V or 48V) at a regulated constant voltage. This conversion is essential because LED strip lights and neon flex cannot run directly from mains power — they require stable DC voltage to produce consistent brightness without flicker or damage to the LED chips.

The terms "LED power supply," "LED driver," and "LED transformer" are used interchangeably across the UK lighting industry in 2026, though they are technically different devices. A true transformer only steps voltage down without rectifying AC to DC. Modern LED drivers perform both functions — voltage conversion and AC-to-DC rectification — in a single enclosure. Throughout this page, we use all three terms because that reflects how electricians and homeowners actually search for these products.

Every LED power supply performs three critical functions:

• Voltage conversion: Steps 230V AC mains down to the DC voltage your LED strip requires, most commonly 24V DC or 48V DC.
• Current regulation: Limits current delivery to protect LED chips from overcurrent damage that would otherwise burn out individual diodes.
• Electrical isolation: Separates the mains-voltage primary circuit from the low-voltage secondary circuit, which is a safety requirement under BS7671 wiring regulations.

When a power supply is correctly specified and installed at the right voltage, its DC output falls within the extra-low voltage (ELV) range. For 48V DC systems, this falls within the SELV voltage threshold under BS7671 (120V DC ripple-free maximum), provided the supply is suitably isolated and safety-rated. This significantly reduces shock risk under dry conditions, though it does not eliminate risk entirely — wet environments or non-isolated supplies change the safety profile.

How do you size an LED power supply correctly?

To size an LED power supply, multiply the wattage per metre of your LED strip by the total metres you are installing, then add a minimum 20% headroom. For example, 5 metres of 14.4W/m strip totals 72W — so you need a driver rated at least 86.4W, meaning a 100W unit is the correct choice. Never run a driver at full rated capacity.

The 20% headroom rule is not optional — it is the single most important factor in driver longevity. A driver running at 80% load operates significantly cooler than one at 100%, and internal component temperatures directly determine lifespan. In 2026, most reputable manufacturers rate their drivers based on continuous operation at 80% load in a well-ventilated enclosure at 25C ambient temperature.

Follow this sizing process for any installation:

1. Check the wattage per metre: This is listed on every ATOM LED product page. Common values range from 4.8W/m for accent lighting up to 24W/m for high-output task lighting.
2. Multiply by total strip length: Measure the actual run length in metres, including any returns or corners.
3. Add 20% headroom: Multiply your total wattage by 1.2 to calculate the minimum driver rating.
4. Round up to the next available size: ATOM LED stocks drivers in standard wattages — 20W, 36W, 60W, 100W, 150W, 200W, 300W, and 600W.
5. Consider ambient temperature: If the driver will sit in an enclosed ceiling void or unventilated cupboard, add 30% headroom instead of 20%, because restricted airflow raises internal temperatures.

For installations where multiple strip runs feed from a single driver, add the total wattage of all connected runs before applying the 20% headroom. If you are unsure about your calculation, call our technical team on 01952 370028 — we size drivers for customers daily and can confirm the correct unit in minutes.

What is the difference between constant voltage and constant current?

Constant voltage power supplies maintain a fixed output voltage (such as 24V DC or 48V DC) while allowing current to vary based on the connected load. Constant current drivers maintain a fixed current output (measured in milliamps) and vary the voltage. LED strip lights and neon flex almost always require constant voltage drivers — constant current is used for individual LED modules and downlights.

This distinction matters because connecting a constant current driver to LED strip will almost certainly damage the strip immediately. The two technologies are not interchangeable, and this is one of the most common specification errors we see at ATOM LED when customers contact our technical support team in Telford.

• Constant voltage (CV): Output stays at a fixed voltage regardless of load. Used for LED strip lights, neon flex, and any product with an onboard current-limiting resistor. This is the driver type ATOM LED stocks and recommends for all strip and neon flex applications.
• Constant current (CC): Output stays at a fixed milliamp value and adjusts voltage to maintain it. Used for individual LED chips, COB modules, and dedicated downlights that specify a current input rather than a voltage input.
• CV + CC (dual mode): Some higher-end drivers can operate in both modes, switching automatically based on the connected load. These are typically used in commercial architectural installations where mixed load types exist on one circuit.

If your product packaging or listing states a voltage input (24V DC, 48V DC), you need a constant voltage driver. If it states a current input in milliamps, you need constant current. Every COB LED strip light and LED neon flex in the ATOM LED range requires constant voltage.

Which IP rating does your LED power supply need?

For indoor installations in dry locations such as kitchens, living rooms, bedrooms, and offices, an IP20 LED power supply is appropriate. For outdoor installations, bathrooms, and any location exposed to moisture, condensation, or direct water contact, you need an IP67-rated driver at minimum. IP65 is not sufficient for sustained UK outdoor conditions or bathroom wet zones under BS7671.

IP ratings on power supplies follow the same international classification system used for LED strip and neon flex, but the consequences of getting it wrong on a driver are more severe. A strip with insufficient IP protection may degrade gradually. A power supply with insufficient IP protection can fail catastrophically — internal corrosion on the PCB causes short circuits that trip your consumer unit or, in worst cases, create fire risk.

• IP20 (indoor only): Open or vented metal enclosure with no moisture protection. Suitable for ceiling voids, under-cabinet spaces, cupboards, and dry utility rooms. Must be mounted in a ventilated position away from heat sources. This is the most common rating for residential kitchen and living room strip installations in 2026.
• IP44 (splash-resistant): Protected against splashes from any direction. Acceptable for some sheltered outdoor positions under permanent cover, though not recommended for fully exposed UK outdoor conditions.
• IP65 (surface splash only): Sealed against dust ingress and low-pressure water jets. Note that IP65 is NOT suitable for sustained UK outdoor exposure or bathroom wet zones as defined under BS7671. Despite common misconception, IP65 does not protect against heavy rainfall, standing water, or prolonged condensation cycles typical of British weather.
• IP67 (temporary immersion): Fully sealed potted enclosure rated for temporary submersion to 1 metre for 30 minutes. This is the minimum recommended rating for any UK outdoor LED power supply, bathroom installations, and garden lighting applications. ATOM LED stocks IP67 drivers across the full wattage range.

One frequently overlooked factor in 2026 is condensation cycling. In the UK, outdoor drivers experience daily temperature swings of 15-20C during spring and autumn, creating condensation inside any enclosure that is not fully sealed. An IP65 driver may survive a direct splash test in a factory but fail within 6-12 months when installed in a real UK garden. This is why we recommend IP67 as the baseline for any outdoor or damp-location installation.

For bathroom installations, identify your bathroom zone classification under BS7671 before selecting a driver. Zone 0 (inside the bath or shower tray) and Zone 1 (directly above bath/shower to 2.25m height) require IP67 minimum. Zone 2 (0.6m around Zone 1) also benefits from IP67 protection. Outside all zones, IP20 is acceptable provided the driver is mounted in a dry, ventilated position.

Do you need a dimmable or non-dimmable power supply?

If you are installing single-colour LED strip and want to adjust brightness from a wall dimmer switch, you need a TRIAC dimmable LED power supply paired with a trailing-edge dimmer. If you are installing RGB, RGBW, or any colour-changing strip, you must use a non-dimmable constant voltage driver with a dedicated controller — never a dimmable driver, as this causes flicker, colour shift, and premature failure.

This is one of the most misunderstood areas in LED installation. The dimming method depends entirely on the strip type, not the buyer's preference. Getting this wrong is the second most common reason LED installations fail, after incorrect sizing.

• Single-colour strip + wall dimmer control: Use a TRIAC dimmable driver with a trailing-edge dimmer switch. Leading-edge dimmers frequently cause visible flicker — if you already have a leading-edge dimmer installed, replacing it with a trailing-edge unit typically costs approximately £15 and solves the problem immediately.
• Single-colour strip + remote/app control: Use a non-dimmable driver paired with a single-colour PWM dimming controller. The controller handles brightness adjustment between the driver and the strip.
• RGB or RGBW colour-changing strip: Use a non-dimmable constant voltage driver with a dedicated RGB or RGBW controller. The controller manages colour mixing and brightness through PWM signals sent to each colour channel independently. A dimmable driver interferes with this signal and causes unpredictable behaviour.
• Tunable white (CCT) strip: Use a non-dimmable driver with a CCT controller. The same principle applies — the controller manages the colour temperature blend between warm and cool white channels.

ATOM LED stocks both dimmable and non-dimmable drivers across 24V and 48V ranges. If you are not sure which type your project needs, our technical team in Telford can confirm the right configuration in a single phone call — 01952 370028, Monday to Friday, 9am to 5pm.

24V vs 48V LED power supply — which voltage should you choose?

Choose 48V for any run exceeding 10 metres or where long cable distances exist between the driver and the strip, because 48V experiences voltage drop at half the rate of 24V over the same distance at the same wattage. Choose 24V for shorter runs under 10 metres, existing 24V installations, or when using 24V-only strip products. Your power supply voltage must exactly match your strip voltage.

Voltage drop is the gradual loss of brightness along a strip run as resistance in the copper conductors reduces the voltage reaching LEDs furthest from the driver. At 24V, this becomes visible on most strips beyond approximately 5-7 metres on a single feed. At 48V, the same strip type typically maintains even brightness to approximately 10-15 metres before correction is needed.

ATOM LED's 48V single-colour COB strip supports 30 metres on a single feed and up to 50 metres on a dual feed — distances that would require multiple drivers and intermediate injection points on a 24V system. This makes 48V the preferred voltage for commercial installations, long corridor runs, cove lighting in large rooms, and perimeter lighting on outdoor terraces in 2026.

• 24V advantages: Wider product compatibility, more controller options available, lower per-unit driver cost on smaller installations, and simpler wiring on runs under 10 metres.
• 48V advantages: Half the voltage drop rate, longer single-feed distances (up to 30m on ATOM LED COB strip), reduced cable cross-section requirements for the same wattage, and lower current draw which extends component lifespan.
• Never mix voltages: A 24V strip on a 48V supply will burn out instantly. A 48V strip on a 24V supply will produce no light or very dim, inconsistent output. Always verify the voltage marked on both the strip and the driver before connecting.

For the 48V range specifically, browse our 48V LED drivers. For 24V options, see our 24V LED driver range. Both collections include IP20 and IP67 enclosures from 20W to 600W.

What wattage LED power supply do I need for common strip lengths?

The wattage you need depends on your strip's power consumption per metre multiplied by total length, plus 20% headroom. A typical 5-metre kitchen under-cabinet run of 14.4W/m COB strip requires a 100W driver. A 10-metre cove lighting run of 9.6W/m strip requires a 120W driver. A 20-metre commercial perimeter installation at 14.4W/m needs a 360W driver or two smaller units wired in parallel.

Below are the most common 2026 installation scenarios with recommended driver sizes. These assume a single continuous run wired from one end. For dual-feed installations or parallel wiring from a central point, the total wattage calculation stays the same — only the distribution changes.

For installations exceeding a single driver's capacity, use multiple drivers wired in parallel rather than one oversized unit. Two 150W drivers feeding a 250W load from opposite ends of a run will deliver more even brightness than a single 300W driver feeding from one end only. This parallel approach also provides redundancy — if one driver fails, half the installation continues operating.

How do you wire an LED power supply safely?

Wire LED power supplies using parallel connections for multiple strip runs, maintain correct polarity (positive to positive, negative to negative), and always install with the mains side connected through a fused spur or dedicated circuit. The DC output side connects to the LED strip via appropriate gauge cable — typically 0.75mm2 for short runs under 5 metres or 1.5mm2 for runs exceeding 5 metres. Mains wiring must be completed by a qualified electrician.

Every LED power supply has two sides: the mains input (230V AC — marked L, N, Earth) and the DC output (marked V+ and V-). The mains side falls under Part P building regulations in England and Wales, meaning a qualified electrician should complete or certify this work for any permanent installation.

1. Plan driver placement: Position the power supply as close to the LED strip as practical to minimise DC cable length. Ensure the mounting location is ventilated — IP20 drivers need free airflow on all sides, with at least 50mm clearance above and below in 2026 specifications.
2. Connect the mains input: Wire through a fused spur or dedicated circuit at the consumer unit. Use a 3A or 5A fuse appropriate to the driver wattage. Connect live (brown) to L, neutral (blue) to N, and earth (green/yellow) to the earth terminal.
3. Run DC output cable: Use appropriately rated twin cable from the driver's V+ and V- terminals to the strip connection point. For runs under 5 metres, 0.75mm2 cable is typically sufficient. For 5–15 metres, use 1.5mm2. For runs exceeding 15 metres, consider 2.5mm2 to minimise voltage drop in the cable itself.
4. Connect to LED strip: Use soldered connections or quality push-fit connectors. Ensure polarity matches — red or marked conductor to V+ and black to V-. Reversed polarity will not damage most modern strips but they will not illuminate.
5. Parallel wiring for multiple runs: Connect each strip run independently back to the driver's output terminals, or use a distribution block. Never wire strip runs in series — series wiring multiplies voltage drop and causes the furthest strip to appear significantly dimmer.
6. Test before final fixing: Power on and verify even brightness along the full strip length before securing cable runs and closing any ceiling voids. Check for any flickering that might indicate a loose connection or incompatible dimmer.

Never power LED strip while it is still coiled on the reel — the concentrated heat from the LEDs cannot dissipate through the stacked layers, which degrades adhesive and creates fire risk. Unroll the full length and mount on an aluminium profile or clean, dry surface before applying power.

Do not mount LED strip directly on bare metal surfaces without insulation between the strip and the metal. The exposed copper pads on the underside of the strip can contact the metal surface and cause a short circuit, which will trip your RCD or damage the driver.

What are the most common LED power supply mistakes?

The five most common mistakes are: running drivers at 100% load without headroom, using dimmable drivers with RGB or RGBW strip, choosing IP20 for outdoor or bathroom locations, using leading-edge dimmers instead of trailing-edge, and installing drivers in unventilated enclosed spaces. Each of these mistakes typically causes failure within 6–18 months of installation.

ATOM LED's technical team in Telford handles support calls related to failed installations weekly. The majority trace back to one of these specification errors rather than any product defect. Understanding these patterns can save significant time and cost on any 2026 installation project.

• Mistake 1 — zero headroom on wattage: A 100W driver running a 98W load operates near thermal limits continuously. Internal electrolytic capacitors degrade approximately 40% faster at elevated temperatures. The fix is simple: always size to 80% maximum load, which means choosing the next driver size up if your calculation falls close to a rated capacity.
• Mistake 2 — dimmable driver on RGB/RGBW strip: RGB and RGBW strips require non-dimmable constant voltage drivers paired with a dedicated LED controller. A dimmable driver modulates its output voltage to achieve dimming, which conflicts with the PWM signals from an RGB controller. The result is flicker, colour banding, and eventual LED channel failure.
• Mistake 3 — wrong IP rating for the environment: IP20 drivers in bathrooms or outdoor locations corrode internally. IP65 drivers in fully exposed outdoor positions degrade within 12 months due to condensation cycling in typical UK climate conditions. Use IP67 minimum for any moisture-exposed location.
• Mistake 4 — leading-edge dimmer with dimmable driver: Most TRIAC dimmable LED drivers are designed for trailing-edge dimmer compatibility. Leading-edge dimmers cause visible flicker, buzzing from the driver, and reduced dimming range. Replacing a leading-edge dimmer with a trailing-edge model costs approximately £15 and resolves the issue immediately.
• Mistake 5 — enclosed mounting without ventilation: Drivers generate heat during normal operation. Mounting in a sealed box, tightly enclosed ceiling void, or insulation-packed space traps this heat and accelerates component degradation. Allow 50mm clearance minimum on all sides, or increase your headroom from 20% to 30% if ventilation is limited.

How long should a quality LED power supply last?

A quality LED power supply from a reputable manufacturer such as Mean Well typically lasts 50,000–70,000 hours under recommended operating conditions, which equates to approximately 11–16 years at 12 hours daily use. This figure assumes the driver is correctly sized with 20% headroom, adequately ventilated, and operating within its rated ambient temperature range of -20C to +50C.

Driver lifespan is measured as MTBF (mean time between failures) by manufacturers, but real-world longevity depends heavily on installation conditions. The three factors with the greatest impact on actual lifespan in 2026 installations are:

• Load percentage: Running at 70-80% of rated capacity can extend operational life by 30-50% compared to continuous 100% load. This is why the 20% headroom rule matters so much — it is not just about safety margin, it directly determines how long your driver will last.
• Ambient temperature: For every 10C increase above the manufacturer's rated ambient temperature, electrolytic capacitor life roughly halves. An IP20 driver rated for 50C ambient but installed in a ceiling void reaching 65C in summer may last only half its expected lifespan.
• Input voltage stability: Frequent power surges, brownouts, or unstable mains supply accelerate degradation of internal components. In areas with known mains quality issues, a surge-protected spur provides additional protection worth the small additional cost.

Budget power supplies from unbranded manufacturers often use lower-grade electrolytic capacitors that dry out within 2-3 years, especially in warm or enclosed mounting positions. The cost difference between a quality Mean Well unit and a budget alternative is typically £8-15 on a 100W driver — a small price for an additional 8-12 years of reliable operation. ATOM LED stocks Mean Well and HiLED branded drivers specifically because their component quality and warranty backing justify the investment for professional installations.

Mean Well vs budget LED power supplies — does brand matter?

Brand matters significantly for LED power supplies because the quality of internal components — particularly electrolytic capacitors, transformer cores, and potting compounds — directly determines lifespan, efficiency, and safety. Mean Well is the most widely specified LED driver brand globally in 2026, with third-party safety certifications (CE, UKCA, TUV, UL) and published test data backing every rated specification. Budget unbranded drivers frequently overstate their wattage ratings and use components that degrade within 2-3 years.

The practical differences between branded and unbranded LED power supplies become apparent in three areas:

• Actual vs stated wattage: A quality 100W driver delivers 100W continuously at its rated ambient temperature. Budget units frequently rate at peak capacity rather than continuous, meaning a "100W" budget driver may sustain only 70-80W before overheating. This effective derating means you need a larger unit than the label suggests.
• Efficiency: Mean Well drivers typically achieve 89-93% efficiency across the range, meaning 7-11% of input power is lost as heat. Budget drivers may operate at 80-85% efficiency, producing 50-75% more waste heat — which further accelerates component degradation in a compounding cycle.
• Safety certification: Genuine CE, UKCA, and TUV marks require independent testing against specific standards (EN61347, EN62384). Budget drivers may carry self-declared CE marks without actual third-party testing. For installations being signed off by a qualified electrician or building inspector, certified drivers avoid potential compliance issues.

ATOM LED supplies drivers from Mean Well and HiLED because both manufacturers provide the technical documentation, safety certification, and consistent manufacturing quality that professional installations require. When you are investing in quality COB LED strip and aluminium extrusion profiles, fitting a budget driver undermines the entire installation. The driver is the foundation — if it fails, everything connected to it goes dark.

Frequently asked questions about LED power supplies

Below are the questions our technical team at ATOM LED in Telford answers most frequently. Every answer reflects real-world installation experience across hundreds of UK residential and commercial LED strip projects completed in 2025 and 2026. Call 01952 370028 or email operations@atomled.co.uk if your question is not covered here.

1. Can I use one LED power supply for multiple strip runs?

• Yes — wire each strip run in parallel back to the driver output terminals. Add the total wattage of all connected runs and apply the 20% headroom rule to determine the minimum driver rating. Never wire strip runs in series, as this multiplies voltage drop and creates uneven brightness across the installation.

2. What happens if my LED power supply is too small?

• An undersized driver runs at or above its maximum rated capacity, generating excessive heat. This accelerates degradation of internal electrolytic capacitors, typically reducing lifespan by 40% or more. Symptoms include dimming after extended operation, audible buzzing, or the driver shutting down entirely via its built-in thermal protection circuit.

3. What happens if my LED power supply is too large?

• An oversized driver operates well within its thermal limits and typically lasts longer than one running at capacity. The only downside is slightly higher purchase cost and a physically larger enclosure. A driver running at 30-50% load wastes no meaningful energy — efficiency remains high across the load range on quality units.

4. Can I use an LED power supply outdoors in the UK?

• Yes, provided you use an IP67-rated driver as the minimum standard for UK outdoor applications. IP65 is not sufficient for sustained exposure to UK weather, particularly the condensation cycling caused by daily temperature swings in spring and autumn. Mount the driver in a position sheltered from direct sustained rainfall where practical, even with an IP67 rating.

5. Why is my LED strip flickering?

• Flickering is most commonly caused by a leading-edge dimmer switch paired with a TRIAC dimmable driver. Replace the dimmer with a trailing-edge model (approximately £15 from any electrical wholesaler). Other causes include a loose DC connection at the driver output, an undersized driver running at thermal cutoff, or using a dimmable driver with RGB strip that requires a non-dimmable unit and dedicated controller.

6. Do LED power supplies make noise?

• Quality LED power supplies should operate silently during normal use. Audible buzzing or humming typically indicates an incompatible dimmer (leading-edge instead of trailing-edge), an overloaded driver running above 90% capacity, or a manufacturing defect. If a new driver buzzes from first use with a compatible setup, contact ATOM LED at operations@atomled.co.uk for a warranty assessment.

7. Can I hardwire an LED power supply permanently?

• Yes — permanent hardwiring through a fused spur is the standard installation method for most residential and all commercial LED strip installations. The mains side of the wiring (230V AC) falls under Part P building regulations in England and Wales, so a qualified electrician should complete or certify this portion of the installation. The DC output side (24V or 48V) can be extended and connected by a competent person.

8. Is a 48V LED power supply safe to touch?

• 48V DC falls within the SELV voltage threshold under BS7671 (120V DC ripple-free maximum), provided it is supplied from a suitably isolated, safety-rated driver. This classification means significantly reduced shock risk under dry conditions. However, SELV does not mean zero risk — wet environments, damaged insulation, or non-isolated supplies change the safety profile. Always treat electrical connections with appropriate care regardless of voltage.

9. How do I know if my existing dimmer is leading-edge or trailing-edge?

• Check the dimmer's packaging, rear label, or manufacturer datasheet for the designation "leading edge" (L), "trailing edge" (T), or "RL" (both). If no marking is visible, older rotary dimmers installed before approximately 2015 are almost always leading-edge. Modern LED-compatible dimmers from brands such as Varilight, Hamilton, and Eaton are typically trailing-edge or dual-mode.

10. Can I connect 24V strip to a 48V power supply?

• Absolutely not — connecting 24V strip to a 48V power supply will destroy the strip immediately. The excess voltage overdrives the LED chips and current-limiting resistors, burning them out within seconds. Always verify that the voltage marked on your strip exactly matches the output voltage on your driver before connecting. If unsure, call ATOM LED on 01952 370028 before powering up.

11. Where should I mount my LED power supply?

• Mount the driver as close to the LED strip as practical, in a ventilated position with at least 50mm clearance on all sides. Common locations include above kitchen cabinets, inside vanity unit carcases, in accessible ceiling voids, or in dedicated electrical enclosures. Avoid mounting inside sealed, unventilated boxes or directly against thermal insulation, as trapped heat reduces lifespan significantly.

12. What cable size do I need from the power supply to the LED strip?

• For DC runs under 5 metres, 0.75mm2 twin cable is typically sufficient for most strip wattages. For runs of 5-15 metres, use 1.5mm2 cable to reduce voltage drop in the cable itself. For runs exceeding 15 metres, 2.5mm2 cable is recommended. Always calculate the current draw (watts divided by voltage) and cross-reference with cable current ratings for your specific installation.

13. Do I need a separate power supply for each room?

• Not necessarily — a single driver can power strip in multiple rooms provided the total wattage (with 20% headroom) falls within the driver's rated capacity. However, separate drivers per room offer advantages: independent switching and dimming control, easier fault diagnosis, and reduced single-point-of-failure risk. For most residential projects in 2026, one driver per room is the practical standard.

14. How do ATOM LED power supplies ship?

• All ATOM LED power supplies ship from our UK warehouse in Telford, Shropshire, with free UK delivery as standard. Orders placed before 2pm on working days typically dispatch the same day. Every driver is UK stock — not dropshipped from overseas — so delivery times are consistent at 1-3 working days. Contact our technical team at operations@atomled.co.uk or call 01952 370028 for bulk order or project pricing.

15. What warranty do ATOM LED power supplies carry?

• ATOM LED power supplies carry the manufacturer's warranty as standard, with full UK-based support from our technical team in Telford. Mean Well drivers include a 5-year warranty when operated within stated parameters. If a driver fails within warranty, contact operations@atomled.co.uk with your order number and a description of the fault — we handle replacements directly from UK stock without overseas returns.

Why choose ATOM LED for your LED power supply?

ATOM LED is a UK LED specialist based in Telford, Shropshire, stocking the full range of constant voltage power supplies from 20W to 600W in 24V and 48V, IP20 and IP67, dimmable and non-dimmable configurations. Every driver ships from UK stock with free delivery — we do not dropship from overseas warehouses. Our technical team sizes and specifies drivers for customers daily on 01952 370028.

• UK stock, free delivery: Every LED power supply in the ATOM LED range is held in our Telford warehouse and ships with free UK delivery as standard — no minimum order, no surcharges.
• Technical support included: Not sure which driver you need? Call 01952 370028 Monday to Friday, 9am to 5pm. Our team will confirm the correct voltage, wattage, IP rating, and dimmable/non-dimmable specification for your project in minutes.
• Matched to ATOM LED strip and neon flex: Every driver we stock is tested and confirmed compatible with our LED strip light and neon flex ranges. No guesswork on compatibility — if you buy strip and driver from ATOM LED, they work together.
• Quality brands only: We stock Mean Well and HiLED drivers — no unbranded, uncertified units. Every driver carries genuine CE and UKCA certification backed by independent testing.
• Complete system available: LED strip, drivers, controllers, extrusion profiles, and strip accessories — everything for a complete installation from one supplier, with one delivery and one point of contact for technical support.

Browse the full ATOM LED power supply range now, or call 01952 370028 / email operations@atomled.co.uk for project-specific advice. Free UK delivery on every order.

Related Collections

• LED transformers and drivers
• 24V dimmable drivers
• 48V drivers for long commercial runs
• LED strip lights
• LED neon flex

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