GU10 LED Bulb 5W 4000K Cool White 60° Wide Flood — Integrated LED, No Bulb to Buy
A GU10 LED bulb at 5W, 520 lumens, 4000K cool white, with a 60° wide beam angle. Push-and-twist fit. Rated for 25,000 hours. Not dimmable. Equivalent to a 50W halogen GU10. Integrated LED — no bulb to buy.
Technical specifications
| Light source | Integrated LED — fixed, non-replaceable |
| Cap type | GU10 — push-and-twist |
| Wattage | 5.0W — equivalent to 50W halogen |
| Colour temperature | 4000K — cool white |
| Luminous flux | 520lm |
| Beam angle | 60° — wide flood |
| CRI | 80 |
| Lifetime | 25,000 hours |
| Surge protection | 1.5kV |
| Dimensions | ø50mm — H57mm |
| Voltage | 240V |
| Dimmable | No — fixed output only |
GU10 LED Bulb 4000K — Cool White, Wide Flood, Task Lighting
Colour temperature is the most consequential choice when selecting a GU10 bulb, and 4000K sits in a distinct category from the warm whites (2700K–3000K) that dominate residential lighting. At 4000K, the light is neutral — neither warm nor cold — with a clean, crisp quality that improves visual clarity and colour accuracy. This makes it the correct choice for task-heavy environments: kitchen worktops where food preparation requires accurate colour rendering, bathroom mirrors where grooming requires even shadow-free light, home offices where screen glare and eye fatigue are a concern, and commercial or retail spaces where product colours need to read accurately. In a living room or bedroom, 4000K will feel clinical compared to 2700K or 3000K — it is not the right choice for atmospheric or relaxation lighting. At 60° beam angle and 520lm, the output and spread suit general ceiling illumination rather than accent or spot work. Not dimmable — if a dimmer circuit is in place, this bulb will flicker or fail prematurely.
For a kitchen with multiple downlights, pairing 4000K wide flood bulbs with under-cabinet warm white strips gives the best of both: task clarity at the worktop and atmosphere at eye level. Confirm the cap type is GU10 (push-and-twist, not GU5.3 or MR16) before ordering. Browse the full LED bulbs collection or read our indoor lighting guide.
Common questions
What is the difference between 4000K, 3000K, and 2700K?
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2700K is extra warm white — amber, close to candlelight, best for living rooms and bedrooms. 3000K is warm white — slightly crisper, suits kitchens and bathrooms where a warmer tone is still preferred. 4000K is cool white — neutral and clean, best for task-heavy spaces where colour accuracy and visual clarity matter more than atmosphere. If unsure, 3000K is the most versatile for residential use; 4000K is the better choice for workspaces and commercial environments.
This bulb is not dimmable — what happens if I fit it on a dimmer circuit?
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Fitting a non-dimmable LED on a dimmer circuit causes flickering, buzzing, or premature failure. If your circuit has a dimmer switch, use the dimmable GU10 variant instead. A dimmer switch has a slider or rotary control rather than a standard rocker — check the switch plate if you are unsure.
Can I use this bulb in a bathroom or outdoor fitting?
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This bulb has no IP rating listed, which means it is not rated for wet or damp environments. For bathroom zones 1 and 2, or for outdoor fittings exposed to moisture, you need a GU10 bulb with a minimum IP44 or IP65 rating. Check the IP rating of your fitting and match the bulb accordingly.
Is 4000K suitable for a home office or study?
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Yes — 4000K is one of the better choices for a home office or study. The neutral white reduces eye fatigue during extended screen use, improves contrast when reading printed documents, and avoids the amber cast of warm white bulbs that can make screens appear washed out. If the room doubles as a relaxation space in the evening, consider a separate warm white lamp for ambient light rather than switching the ceiling bulbs.
Is this a direct replacement for a 50W halogen GU10?
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Yes — this 5W LED is the direct equivalent of a 50W halogen GU10 in lumen output (520lm vs the typical 500–600lm of a 50W halogen). The cap type is identical (GU10 push-and-twist), so it fits the same fittings. The colour temperature will differ: most halogen GU10s run at 2700–3000K, so switching to 4000K will produce a noticeably cooler, crisper light. That is the intended effect for task environments, but worth confirming before replacing all bulbs in a room.
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