B15 (SBC) Pygmy Bulb 15W 60lm Non-Dimmable - Warm White 2800K

This is a 15W pygmy bulb with a B15 small bayonet cap, the short clear glass lamp that goes into compact appliance fittings rather than into a shade. It puts out 60 lumens, and the retail pack prints a colour temperature of 2,800 Kelvin, so the light is genuinely warm and yellow rather than white. Because the glass is clear, the filament stays visible and the light comes from a small bright point instead of a diffused surface. Its energy label reads class G, at 15kWh per 1,000 hours.

The pack marks it as an appliance bulb, and 60 lumens is roughly nightlight territory, so think of it as a bulb that lights the inside of something rather than a room. Before ordering, look at the cap on the bulb you are replacing. A B15 is a bayonet cap 15mm across, so it pushes in and twists rather than screwing, and it is the smaller relative of the B22 cap used in ceiling pendants. If the old bulb screws in, you need an E14 or E27 and this one will not seat. It is worth checking the maximum wattage marked on the fitting too, since 15W is a filament load rather than an LED one.

The specification lists it as non-dimmable, so give it a plain on/off switch. The pack prints a lamp life of 1 year or 1,000 hours and more than 8,000 on/off cycles, which is the number that matters in a fitting flicked on and off all day. It also prints a colour rendering index of 100, so nothing shifts colour under it. Each box holds one bulb and the minimum order is 10, in multiples of 10, so spares come as standard. The same pygmy is also listed as a two pack, and our wider B15 range runs to LED candle and golf bulbs.

How do I tell whether my fitting takes a B15 cap?

Look at the base of the bulb you are taking out. A B15 cap is a bayonet 15mm across with two small side pins, so it pushes in and twists a quarter turn; a screw base is an E14 or E27 and will not fit.

How bright is 60 lumens in practice?

Not very, and that is the point of it. Sixty lumens is around nightlight level, so it lights the inside of a small enclosure or gives a soft glow rather than lighting a room.

Can I run it on a dimmer switch?

The specification lists this lamp as non-dimmable, so pair it with a plain on/off switch. We would not recommend a dimmer against a non-dimmable specification.

Does it cope with being switched on and off often?

The pack prints more than 8,000 on/off switching cycles, and a filament lamp comes up to full brightness the instant it is switched on, with no warm-up delay.

Is an IP rating given, and can it go outdoors?

No IP rating is printed by the manufacturer, so treat the bulb as unrated against moisture and keep it to dry indoor fittings only.

Is an equivalent wattage printed for this bulb?

No. Neither the specification nor the pack gives an equivalence figure, and as this is itself a 15W filament lamp, match it against the wattage of the bulb you are replacing.