JCB 8.5W LED GLS Bulb B22 Cool White 4000K Non-Dimmable

The JCB 8.5W LED GLS bulb delivers 806 lumens of cool white 4000K light through a standard B22 bayonet cap fitting. The GLS (General Lighting Service) shape is the classic pear-shaped bulb form, making it a direct replacement for traditional 60W incandescent bulbs in ceiling pendants, table lamps, and wall-mounted fittings across residential and commercial settings.

Designed for task-focused environments, the 4000K colour temperature produces a crisp, neutral white light that suits kitchens, bathrooms, home offices, workshops and retail spaces where colour accuracy and clarity matter. The non-dimmable design provides stable, flicker-free output at full brightness on standard switched circuits, eliminating the compatibility issues that can occur when dimmable LEDs are paired with incompatible dimmer switches.

The 180-degree beam angle provides omnidirectional light distribution similar to incandescent bulbs, filling a room rather than creating a focused spotlight effect. At 8.5W consumption compared to the 60W incandescent equivalent, the bulb uses 86% less energy while matching the light output. The bulb measures 60mm diameter by 110mm height, fitting standard lamp shades and enclosed fittings without projection issues.

JCB rates this bulb with an Energy Rating of F under the updated 2021 EU energy labelling scale, which replaced the previous A++ to E scale with a stricter A to G scale. The F rating reflects the tightened criteria rather than reduced efficiency — this bulb remains a significant energy saving over halogen and incandescent alternatives.

What does 4000K cool white look like?

4000K produces a neutral, crisp white light without the yellow warmth of 2700K-3000K bulbs or the blue tint of 5000K+ daylight bulbs. It's often described as similar to natural daylight on an overcast day and is preferred in kitchens, bathrooms and offices where task clarity matters more than ambient warmth.

Can this bulb be used with a dimmer switch?

No. This bulb is non-dimmable and should only be used on standard on/off switched circuits. Using it with a dimmer switch may cause flickering, buzzing, or premature failure.

What incandescent wattage does this replace?

This 8.5W LED bulb produces 806 lumens, which is equivalent to a traditional 60W incandescent bulb. It provides the same light output while using 86% less energy.

Will it fit in enclosed light fittings?

Yes. The 60mm diameter and 110mm height fit standard GLS lamp holders and work in enclosed ceiling fittings, table lamps and wall lights. LED bulbs generate less heat than incandescent, making them safer in enclosed fittings.