JCB 3W GU10 LED Bulb Non-Dimmable - Cool White 4000K

The JCB 3W GU10 LED bulb is a non-dimmable spotlight replacement delivering 230 lumens at 4000K cool white through a 100° beam angle. The GU10 twist-and-lock base fits standard UK spotlight fittings in kitchens, bathrooms, retail spaces and offices where task lighting or general illumination is needed. At 3W, the bulb replaces a 35W halogen equivalent, reducing energy consumption by approximately 91%.

Designed for recessed downlights, track spotlights and surface-mounted ceiling fittings, the 4000K colour temperature produces a neutral white light that sits between warm domestic tones (2700K-3000K) and cooler commercial daylight (5000K+). This makes it suitable for workspaces, kitchens and bathrooms where colour accuracy matters for food preparation, grooming or detailed tasks, while still being comfortable enough for residential use. The 100° beam angle provides wide coverage from a single fitting, reducing the number of bulbs needed to light a room compared to narrow-beam alternatives.

The bulb measures 57mm tall and 50mm in diameter, fitting flush into most standard GU10 downlight housings without protruding below the ceiling line. The rated lifespan reaches up to 10 years under typical domestic use (approximately 15,000 hours), reducing the frequency of replacements in hard-to-reach ceiling installations. The bulb carries an Energy Rating of F under the updated UK energy label scale introduced in 2021, which rates all lighting products on a stricter A-G scale than the previous A+++ system.

Is this bulb dimmable?

No. This is a non-dimmable LED bulb. Installing it on a dimmer circuit may cause flickering, buzzing or premature failure. If dimming is required, search for JCB GU10 dimmable variants in the bulbs category.

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

4000K produces a neutral cool white light similar to daylight through a north-facing window, while 3000K gives a warmer, slightly yellower tone closer to traditional incandescent bulbs. 4000K is often chosen for kitchens, bathrooms and workspaces; 3000K for living rooms and bedrooms.

Will this fit my existing GU10 downlight housing?

Yes, if your existing fitting takes standard GU10 twist-lock bulbs. The 57mm height and 50mm diameter are typical for GU10 LEDs and will fit most recessed downlight housings designed for halogen GU10 bulbs.

How bright is 230 lumens?

230 lumens is comparable to a 35W halogen GU10. For task lighting in a kitchen or bathroom, you typically need 3-4 of these bulbs per 3m² area. For general room lighting, fewer bulbs are needed depending on ceiling height and room colour.