B15 (SBC) LED Golf Bulb 5W 470lm Dimmable - Cool White 4000K

A golf ball bulb on a B15 small bayonet cap, drawing 5W and giving 470 lumens of cool white light at 4000K. The B15 cap is the narrower of the two bayonet fittings, with two small pins on a 15mm barrel, so check the old bulb before ordering: a B22 holder is noticeably wider and the two are not interchangeable. The glass is frosted, which spreads the output evenly instead of letting the diodes show as bright points, and the 240 degree beam angle sends light almost all the way around the body.

Golf bulbs are the small round lamps fitted where a full size GLS would look oversized: wall lights, bedside lamps, small pendant clusters, chandelier arms and the little fittings above mirrors. At 4000K the light reads as a clean neutral white rather than the yellow of an old filament lamp, which suits kitchens, home offices, utility areas and stairs where you want to see properly. It is a cooler light than warm white, so if the rest of the room runs on 2700K lamps the difference will be obvious; fitting a whole set at once keeps a space consistent.

The bulb is dimmable and the pack carries the dimming symbol. Use a trailing edge LED dimmer, and note that at 5W each, even several of these on one circuit can fall below an older mains dimmer's minimum load, which shows as flicker or a refusal to start. The pack states a life of 25,000 hours and instant start, so there is no warm up to full output. Energy class is E, and the label gives 5 kWh per 1,000 hours. One unit is a single bulb, and the minimum order is 10, sold in multiples of 10. We also stock a B15 candle bulb in warm white 2700K if you want a different shape on the same cap.

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

Look at the metal base of the old bulb. B15 is a 15mm barrel with two small locating pins, roughly the width of a pencil, while B22 is a wider 22mm barrel used on standard household bayonet lamps.

Will it dim properly on my existing dimmer switch?

It is a dimmable bulb, but it needs a dimmer suited to LED loads, ideally trailing edge. At 5W per lamp the total load can sit under an older dimmer's minimum, which usually shows as flicker.

Is 470 lumens bright enough to replace my old bulb?

The pack gives it as a 40W replacement, so it should match a traditional 40W golf lamp closely. If your old bulb was 25W it will read brighter, and a 60W will read dimmer.

What does cool white 4000K actually look like?

It is a neutral white with no yellow cast and no blue edge, the sort of light used in kitchens and work areas. Warm white at 2700K is much softer and more amber by comparison.

How many bulbs will I receive?

Each unit is one bulb in its own box. The minimum order on this listing is 10 units, sold in multiples of 10, so the smallest purchase is 10 bulbs.

Does the frosted glass affect the light output?

The frosting diffuses the light so the individual diodes are not visible as hot spots. The rated output of 470 lumens already accounts for it, so nothing is lost by choosing frosted.