JCB 14W LED GLS Bulb Cool White 4000K B22 - Non-Dimmable

The JCB 14W LED GLS bulb delivers 1521 lumens of 4000K cool white light through a standard B22 bayonet cap fitting. The GLS (General Lighting Service) shape matches the familiar profile of traditional incandescent bulbs, making it a direct replacement for 100W incandescent lamps in ceiling lights, desk lamps and task lighting fixtures across kitchens, bathrooms, offices and utility rooms.

Designed for spaces where clarity and focus matter, the 4000K colour temperature produces a crisp, neutral white light that sits between warm white (2700K-3000K) and daylight white (5000K+). This makes the bulb well-suited to food preparation areas, bathrooms where grooming tasks require accurate colour rendering, home offices, workshops and garages where detailed work is carried out. The 180-degree beam angle provides wide, even coverage from a single overhead fitting.

The bulb is non-dimmable and should be paired with standard on/off switches only. Attempting to use it with a dimmer will cause flickering or damage. The B22 bayonet cap fits standard UK BC lamp holders with a quarter-turn clockwise lock, and the 60mm diameter and 120mm height match the envelope dimensions of a traditional GLS bulb, so it fits inside existing shades and diffusers without protrusion.

JCB rates this bulb at Energy Rating F under the revised 2021 EU energy label scale (which downgraded most LED bulbs from A+ to E-G). At 14W input for 1521 lumens output, the bulb achieves approximately 109 lumens per watt, which is competitive with other non-dimmable B22 LED GLS bulbs at this power level. The bulb carries a rated lifespan of up to 10 years under typical domestic use (2.7 hours per day average), though actual lifespan varies with switching frequency and ambient temperature.

Can this bulb be used with a dimmer switch?

No. This is a non-dimmable bulb and must only be used with standard on/off switches. Using it with a dimmer will cause flickering, buzzing, or premature failure of the bulb.

What is the difference between 4000K and 3000K?

4000K is a cool white that produces a crisper, more neutral light similar to daylight on an overcast day. 3000K is a warm white that gives a softer, yellower light closer to traditional incandescent bulbs. 4000K suits task-oriented spaces like kitchens and offices; 3000K suits living rooms and bedrooms.

Will this fit my existing lamp shade?

The bulb measures 60mm in diameter and 120mm in height, matching the standard GLS envelope size. It should fit any shade or diffuser designed for a traditional 60W-100W incandescent GLS bulb. If your shade is very tight or enclosed, check that there is adequate ventilation around the bulb to prevent heat build-up.

How long does it last?

JCB rates this bulb for up to 10 years of life based on average domestic use of 2.7 hours per day. Actual lifespan depends on how frequently the bulb is switched on and off and the ambient temperature where it operates. Frequent switching and high ambient temperatures reduce lifespan.