JCB 8.5W LED GLS Bulb E27 Cool White 4000K Non-Dimmable - 806lm

The JCB 8.5W LED GLS bulb provides 806 lumens of 4000K cool white light from a standard E27 Edison screw base, delivering the light output of a 60W incandescent bulb while consuming 85% less energy. The GLS (General Lighting Service) shape is the classic A60 bulb profile, fitting directly into pendant lights, ceiling fixtures, table lamps and wall-mounted fittings without adaptors.

The 4000K colour temperature sits between warm white and daylight, producing a neutral cool white tone that works well in kitchens, bathrooms, utility rooms, home offices and commercial spaces where clarity and visibility matter more than ambient warmth. The 180-degree beam angle spreads light evenly across the room rather than directing it in a narrow cone, making this a general-purpose bulb for spaces needing even overhead or area lighting.

This bulb is non-dimmable and should not be paired with dimmer switches — attempting to dim it may cause flickering or damage. The Energy Rating of F reflects updated EU energy labelling standards introduced in 2021, where all LED bulbs were re-rated on a stricter A-G scale. Under the previous scale this bulb would have rated A+. The 60mm diameter and 110mm height fit within the envelope of most lampshades and enclosed fixtures.

Can this bulb be used with a dimmer switch?

No. This bulb is non-dimmable and should not be used with dimmer switches. Attempting to dim it may cause flickering, buzzing or premature failure. If you need dimmable E27 bulbs, use the filters to find dimmable variants in stock.

What does 4000K cool white look like?

4000K sits in the neutral zone between warm white (2700K-3000K) and daylight (5000K-6500K). It produces a crisp, clean white light without the yellow warmth of traditional incandescent bulbs or the harsh blue tone of daylight bulbs. Most buyers use 4000K in kitchens, bathrooms and workspaces where task visibility matters.

How long does this bulb last?

JCB rates its LED bulbs at up to 10,000 hours of operation. At 3 hours per day that equates to roughly 9 years before replacement. Actual lifespan depends on the number of on/off cycles, ambient temperature and whether the bulb is used in enclosed or ventilated fixtures.

Will it fit inside an enclosed lampshade?

Yes. The 60mm diameter and 110mm height are standard GLS dimensions, so the bulb fits inside most traditional lampshades, pendant shades and enclosed ceiling fixtures. LED bulbs generate less heat than halogen or incandescent, making them safer in enclosed fittings.