Energizer LED Golf Ball Bulb B15 4.2W Opal Dimmable - Warm White 2700K

This is a small bayonet golf ball bulb, the B15 or SBC cap, so it twists and locks into place on two pins rather than screwing in. It draws 4.2W and gives 470 lumens, and the pack puts that at a 40W replacement, which is the figure to work to if you are taking out an old incandescent golf ball. The colour temperature is 2700K warm white, the soft yellowish light most people associate with a living room rather than a workshop. The pack quotes that output in a sphere, which tells you the light spreads all round rather than being thrown forward in a beam.

B15 is the smaller of the two bayonet caps, and it turns up on fittings the bigger B22 will not suit: bedside and table lamps, multi-arm pendants and chandelier arms, small wall lights, picture lights and older standard lamps. Check the cap on the old bulb before ordering, because B15 and B22 look alike at a glance and differ mainly in the width across the pins. Warm white at this output suits a lamp you sit beside in the evening, a landing light, or a fitting holding several lamps where the total output matters more than any one of them.

Because it is dimmable, it will work on a trailing edge or LED compatible dimmer, and if you have several lamps on one circuit keep them all to the same type so they fade together. The energy rating is E. The pack prints a 15 year lifespan and 15,000 hours. Each unit is a box of one bulb, and the minimum order is 12, sold in multiples of 12, which works out well for relamping a whole house at once. Our wider B15 range runs to the same 4.2W 470lm lamp in a candle shape, a non-dimmable version, a 7.3W 806lm option and a cool white 4000K candle.

How do I know if my lamp takes a B15 cap?

Pull out the old bulb and look at the base. B15 has two small pins on a bayonet cap about 15mm across, so it is noticeably slimmer than the common B22 bayonet found on ceiling roses.

Will it work on my dimmer switch?

It is dimmable, and it wants a trailing edge or LED rated dimmer rather than an old resistive one. Where a circuit holds several lamps, fit the same bulb throughout so they dim evenly.

How bright is 470 lumens next to my old bulb?

The pack calls it a 40W replacement, so it should look much like the 40W golf ball it stands in for, at 4.2W instead of 40W.

What does 2700K warm white actually look like?

Soft and slightly yellow, close to the old incandescent light. It flatters creams, woods and warm paint colours, and it is easier on the eye late in the evening than a cooler 4000K lamp.

Is an IP rating given for this bulb?

The manufacturer states no IP rating for this lamp, so we make no claim about water or dust protection. Treat it as a bulb for ordinary dry indoor fittings.

How many bulbs do I receive?

One unit is a box containing a single bulb. The minimum order on this listing is 12 units, sold in multiples of 12, so the smallest purchase is twelve bulbs.