B15 (SBC) LED Golf Bulb 4.2W 470lm - Warm White 2700K

This is a golf ball LED bulb on a B15 small bayonet cap, drawing 4.2W and giving 470 lumens of warm white light at 2700K. The golf shape is the compact round bulb made for small shades and for fittings where a full-sized GLS bulb would crowd the glass, and the white envelope spreads the light into an even glow rather than bright points. B15 is the smaller of the two bayonet caps: two pins on a 15mm barrel, pushed in and turned a quarter turn, against the 22mm barrel of the more common B22. The pack lists this as a 40W replacement.

B15 turns up on wall lights, bedside lamps, picture lights and plenty of older table lamps, so check the cap before ordering: B15 and B22 look alike in a dim hallway. At 470 lumens this is a lamp you sit beside rather than the only light in a room, though two or three in a multi-arm fitting reach a comfortable level for a sitting room. The 140 degree beam spreads light widely instead of pushing it forward, which suits a shade that lights upwards and downwards as much as an open fitting where the bulb is on show. At 2700K the tone is warm and yellow-leaning, kind to wood, brass and warm paint.

It is not dimmable, so keep it on a plain on/off switch; a non-dimmable LED on a dimmer can flicker, buzz or fail early. The rating is IP20, which is ordinary dry indoor use. The pack prints a 15 year lifespan and 15,000 hours, and the energy label rates it class E at 5kWh per 1,000 hours. Each box holds one bulb, with a minimum order of 12 in multiples of 12. Our wider B15 range runs to the same 470lm output in a candle shape and a brighter 7.3W 806lm option on the same cap.

How do I tell a B15 cap from a B22 before I order?

Both push in and twist a quarter turn, but B15 has a 15mm barrel and B22 a 22mm one. Hold the old bulb against a standard household bulb: if the metal cap looks noticeably slimmer, B15 is what you need.

Can I use it with a dimmer switch?

No. The specification gives it as non-dimmable, so it belongs on a plain on/off switch. Fitted to a dimmer circuit, a non-dimmable LED can flicker, hum at low settings or fail well before its rated life.

How bright is 470 lumens in practice?

It is the sort of output an old 40W incandescent gave, and the pack calls it a 40W replacement. Comfortable for a bedside or table lamp, or in a multi-arm fitting where two or three bulbs work together.

What will 2700K warm white look like beside my other bulbs?

Warm and slightly yellow, close to old filament lighting rather than the whiter light of 4000K or 6500K lamps. Mixing it with cooler bulbs in one room makes the difference obvious, so match the whole fitting.

Will it fit inside a small shade or an enclosed fitting?

A golf bulb is the compact round shape, shorter and narrower than a standard GLS bulb, so it clears shades that a GLS crowds. The manufacturer does not state overall dimensions, so measure if space is tight.

How many do I have to buy?

Each box holds one bulb and the minimum order on this listing is 12, sold in multiples of 12. That suits fitting out a multi-lamp chandelier or keeping spares for matched wall lights.