Energizer 3.6W GU10 Dimmable LED Bulb Cool White 4000K (4 Pack)

The Energizer GU10 LED is a 3.6W dimmable spotlight bulb producing 345 lumens of cool white light at 4000K, packaged in a four-pack for multi-room installations or larger spaces. The GU10 twist-and-lock base fits standard UK mains-voltage spotlight fittings without requiring a transformer, making it a direct replacement for 50W halogen GU10s in downlights, track lighting and recessed ceiling spots.

Designed for task and accent lighting in kitchens, bathrooms, home offices and utility rooms, the 4000K colour temperature sits between warm white and daylight, offering clarity without the blue cast of cooler temperatures. The 36-degree beam angle provides a focused pool of light rather than wide flood coverage, concentrating output on worktops, mirrors and reading areas. The dimmable function allows brightness adjustment from full 345 lumens down to a low level, compatible with most leading-edge and trailing-edge dimmer switches.

Each bulb measures 50mm diameter by 54mm height, fitting flush into standard GU10 downlight housings. The four-pack format allows consistent colour temperature across multiple fittings in the same room or hallway, avoiding the mismatched light tones that occur when mixing bulb batches. Energizer rates the lifespan at 15 years based on average domestic use of 3 hours per day, equivalent to approximately 15,000 hours total runtime.

The 3.6W consumption represents a 93% energy reduction compared to the 50W halogen bulbs these replace, lowering electricity costs without sacrificing light output. The bulbs carry an E energy rating under current UK energy labelling and operate on 230V mains power with no starter or driver required beyond what's built into the bulb itself.

Are these bulbs compatible with dimmer switches?

Yes, these Energizer GU10 LEDs are dimmable and work with most leading-edge and trailing-edge dimmers. Performance varies by dimmer model — some may have a higher minimum dim level than others. If you experience flickering at low settings, the dimmer may need upgrading to an LED-compatible model.

What's the difference between 4000K and 3000K?

4000K is cool white — a neutral, slightly crisp tone suited to task lighting in kitchens, bathrooms and work areas. 3000K is warm white with a yellow-orange cast closer to halogen or incandescent bulbs, typically preferred in living rooms and bedrooms. The 4000K in this pack provides better colour rendering for food prep, shaving, makeup application and reading.

Do I need a transformer for GU10 bulbs?

No. GU10 bulbs run directly on 230V mains voltage. The twist-and-lock base connects straight into the fitting with no external transformer required. This is different from GU5.3/MR16 bulbs, which operate on 12V and do require a transformer.

How long do these bulbs last?

Energizer rates them at 15 years based on 3 hours of use per day, equivalent to approximately 15,000 hours total runtime. Actual lifespan depends on usage patterns, heat build-up in the fitting, and how often they're switched on and off.