Energizer 3.6W GU10 Dimmable LED Bulb - 3000K Warm White 345lm

The Energizer 3.6W GU10 is a dimmable LED spotlight bulb producing 345 lumens at 3000K warm white, designed as a direct replacement for 50W halogen GU10s. The bulb features a 36° narrow beam angle, focusing light into a defined spot rather than spreading it across a wide area, making it suitable for recessed downlights, track lighting and accent fixtures where directed illumination is needed.

Designed for UK residential and commercial installations, the GU10 fitting suits standard mains-voltage spotlight fittings without requiring a transformer. The dimmable LED works with most leading-edge and trailing-edge dimmer switches, allowing brightness to be adjusted from full 345-lumen output down to a low ambient level depending on the time of day or room use. The 15-year rated lifespan at average use of 3 hours per day reduces bulb replacement frequency compared to halogen equivalents.

The clear glass envelope shows the LED chip array inside, presenting as a cluster of small yellow diodes when unlit. When powered, the 3000K colour temperature produces a warm white tone comparable to traditional halogen, avoiding the cooler blue-white cast of higher Kelvin ratings. At 50mm diameter and 54mm height the bulb sits flush or slightly recessed in most GU10 downlight housings. The compact 0.05kg weight suits ceiling fittings without additional support.

Energy rating E reflects the efficiency of converting 3.6W input into 345 lumens output, delivering approximately 96 lumens per watt. The 36° beam angle concentrates light into spotlighting applications rather than general room illumination, so multiple bulbs are typically needed across a ceiling grid to achieve even coverage in kitchens, bathrooms and hallways.

Is this bulb compatible with dimmer switches?

Yes. The bulb is rated as dimmable and works with most leading-edge and trailing-edge dimmer switches. Compatibility depends on the specific dimmer model and the total load on the circuit, so if you experience flickering or insufficient dimming range, the dimmer may need upgrading to an LED-compatible model.

What's the difference between 3000K and higher colour temperatures?

3000K is classified as warm white and produces a yellow-toned light comparable to traditional halogen bulbs, creating a warmer atmosphere. Higher colour temperatures like 4000K (cool white) or 6000K (daylight) produce whiter or blue-toned light that feels brighter and more clinical, often preferred in task-focused environments like workshops or offices.

How many of these bulbs are needed to light a room?

The 36° beam angle focuses light into a spot, so coverage depends on ceiling height and spacing. For a 3m x 3m kitchen with a 2.4m ceiling, 4-6 bulbs spaced evenly typically provide adequate general illumination. Larger rooms or higher ceilings require more bulbs or higher-lumen variants.

Does the 15-year lifespan apply regardless of how often the bulb is used?

The 15-year rating assumes average use of 3 hours per day. If the bulb runs for longer daily periods, the lifespan in years will be shorter, though the total number of operating hours remains the same. Frequent on-off switching can also reduce lifespan slightly compared to continuous use.