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

The Energizer LED Golf Ball is a 4.2W dimmable LED bulb with a B15 small bayonet cap, producing 470 lumens of warm white light at 2700K. The golf ball form factor measures approximately 45mm in diameter, making it suitable for compact decorative fittings including chandeliers, wall lights, bedside lamps and ceiling fixtures where a smaller bulb profile is needed.

Designed as a direct replacement for traditional 40W incandescent golf ball bulbs, this LED draws 4.2W while delivering the same 470-lumen output, cutting energy consumption by approximately 90%. The bulb is fully dimmable when paired with compatible LED dimmer switches, allowing brightness adjustment from full output down to low ambient levels for evening use. The 2700K colour temperature produces a warm, slightly amber-toned white light that pairs well with traditional and warm-toned interiors.

The bulb carries a 15-year lifespan rating based on typical domestic use of 2.7 hours per day, translating to approximately 15,000 hours of operation before noticeable lumen degradation. The B15 small bayonet cap fits standard SBC sockets found in many UK decorative light fittings, with the two-pin bayonet mechanism providing a secure twist-and-lock connection. The frosted glass envelope diffuses the LED filament to give even light distribution without harsh point-source glare.

What does B15 mean and will it fit my lamp?

B15 is a small bayonet cap, also called SBC. It has two pins on either side of a 15mm-diameter base that twist and lock into the socket. This is the smaller of the two common UK bayonet fittings — the larger one is B22. Check your existing bulb or socket before ordering to confirm you need B15 rather than B22.

Is this bulb compatible with dimmer switches?

Yes, the bulb is dimmable but requires an LED-compatible dimmer switch. Traditional incandescent dimmers may cause flickering, buzzing or limited dimming range. If you're using an older dimmer installed for halogen or incandescent bulbs, you may need to replace it with an LED-rated dimmer for smooth performance.

What's the equivalent incandescent wattage?

This 4.2W LED produces 470 lumens, which is equivalent to a traditional 40W incandescent golf ball bulb. The energy saving is approximately 90% while maintaining the same light output.

How long does the 15-year lifespan last in practice?

The 15-year rating assumes 2.7 hours of use per day, which totals approximately 15,000 hours. If you use the bulb for longer periods daily, the calendar lifespan will be shorter, but the total operating hours remain the same. For example, 6 hours daily use would give roughly 7 years of service.