B22 (BC) LED GLS Bulb 12.6W 1521lm Dimmable - Cool White 4000K

This is a 12.6W LED GLS bulb on a B22 bayonet cap, the standard push-and-twist fitting British homes have used for decades. GLS is the classic pear-shaped household bulb profile, and the glass here is opal rather than clear, so the diodes inside sit behind a softly diffused surface rather than showing as bright points. It gives 1521lm at 4000K, a cool white that reads clean and slightly blue-leaning against the yellower 2700K warm whites. The pack puts it forward as a replacement for a 100W incandescent, which makes it one of the brighter household bulbs rather than a like-for-like swap for a 60W.

Cool white at this brightness suits rooms where you want to see clearly: kitchens, utility rooms, garages, workshops, home offices and hallways that never get much daylight. In a pendant with an opal or fabric shade it fills a room evenly; in an open pendant or on a bare batten it will be bright, so think about where the bulb sits relative to eye level. If the rest of your lighting is warm white, mixing 4000K into the same room is noticeable, so it is usually better to run a whole room on one colour temperature.

It is dimmable, so it will work on a dimmer circuit, though LED dimming depends on the dimmer as much as the bulb; a trailing-edge dimmer rated for LED loads gives the smoothest result, and an older resistive dimmer built for filament bulbs may buzz or flicker. The pack prints a 15 year lifespan, and the energy rating is E. Each box holds one bulb, and the minimum order is 12, sold in multiples of 12. It sits alongside our wider range of LED bulbs in B15 candle and golf, GU10 and 2G11 fittings.

How do I know if my fitting takes a B22 cap?

Take the old bulb out and look at the base. A B22 cap is smooth metal with two small pins on the sides, and it pushes in and twists a quarter turn rather than screwing.

What does 4000K cool white actually look like in a room?

It is a clean, neutral white with no yellow in it, closer to daylight than to candlelight. Good for kitchens and work areas, less cosy than 2700K in a sitting room.

Will it dim properly on my existing dimmer switch?

The bulb is dimmable, but the switch matters. A trailing-edge dimmer rated for LED loads dims it smoothly; an older dimmer designed for filament bulbs may buzz, flicker or refuse to go low.

Is it as bright as the 100W bulb I am replacing?

The pack rates it as a 100W replacement and it produces 1521lm, so in a shade or a pendant it should read as comparably bright while drawing 12.6W.

Does the manufacturer state an IP rating?

No IP rating is given on the specification or the retail pack, so we cannot quote one. Use it in ordinary enclosed or open indoor fittings, as you would any standard household bulb.

How many bulbs do I receive?

Each box contains one bulb. This listing carries a minimum order of 12 boxes, sold in multiples of 12, so you would receive twelve individually boxed bulbs.