B15 (SBC) LED Golf Bulb 4.2W 470lm Dimmable - Daylight 6500K

A golf bulb is the small round lamp that suits bedside lights, wall fittings and compact pendants, and this one takes the B15 small bayonet cap, a slimmer two-pin bayonet than the more common B22. The dome is frosted, so light leaves it spread rather than as a hard point, and the LED inside gives 470 lumens at 6500K. That is daylight white, the crispest of the white tones, with a cool edge rather than the yellow of a filament. The box front prints 5W and a 40W replacement, while the detailed specification gives the draw as 4.2W.

Daylight white at this brightness is a working light rather than a restful one. It suits a desk lamp, a reading light, a kitchen or utility fitting, a garage inspection lamp or a workshop pendant, anywhere you need to see detail and judge colour properly. It is less suited to a sitting room in the evening, where 2700K warm white is the usual pick. The 240 degree spread matters in multi-arm fittings and open-ended shades: light carries sideways and upwards as well as down, so a fitting lights the room evenly rather than throwing one pool downwards. IP20 is the ordinary indoor rating, so keep it to dry domestic fittings.

It dims, which is worth knowing because many small LED lamps do not, and it wants a dimmer rated for LED loads. A single 4.2W lamp draws very little, and an older dimmer built for 40W filament bulbs may need more load than one bulb gives before it runs smoothly. The pack states a 25,000 hour life and instant start, so there is no warm-up. The energy rating is E on the current label scale. One unit is a single bulb and the minimum order is 10, sold in multiples of 10. We also stock a B15 candle bulb at the same 470 lumens in warm white 2700K.

How do I tell a B15 cap from a B22 or an E14?

B15 is a bayonet cap with two side pins, like a B22, but noticeably narrower at 15mm across. E14 is a screw thread instead, so if your old bulb screwed in rather than pushing and twisting, this one will not fit.

Is 470 lumens bright enough to replace my old bulb?

The pack rates it as a 40W replacement, so it should match a 40W filament golf bulb closely. If your old lamp was a 25W, expect a clear step up in brightness from this one.

Will it work on a dimmer switch?

Yes, the specification confirms it is dimmable. Use a dimmer designed for LED loads, and bear in mind that one 4.2W lamp on an old filament dimmer may sit below that dimmer's minimum load and flicker.

What does 6500K daylight white actually look like?

It is a cool, crisp white with a slight blue cast, close to midday light. Colours read accurately under it, which helps for reading, cooking and detailed work, but it feels brisk in an evening sitting room.

Does the wide beam angle suit a shade with an open top?

It does. At 240 degrees the light spreads sideways and upwards as well as downwards, so open-ended shades, multi-arm fittings and glass pendants are lit evenly rather than from below only.

How many bulbs do 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 ten single bulbs.