Energizer 4W LED Golf Ball Filament Bulb B15 2700K - Non-Dimmable

The Energizer 4W LED golf ball bulb is a B15 bayonet-cap replacement for traditional 40W incandescent golf balls, delivering 470 lumens of warm white light at 2700K. The exposed filament design mimics the look of vintage Edison bulbs, making the bulb itself visible and decorative when fitted in chandeliers, wall sconces and open-shade table lamps where the bulb is part of the aesthetic.

Designed for use in compact fixtures where the golf ball shape (approximately 45mm diameter) fits more comfortably than a standard GLS bulb, this Energizer bulb suits hallway wall lights, bathroom mirror lights, bedside table lamps and decorative ceiling fittings with multiple arms. The B15 small bayonet cap (SBC) is common in UK residential lighting fixtures manufactured before the 2000s and remains standard in many decorative fittings. The 470-lumen output provides ambient rather than task lighting, suitable for spaces that need softer illumination rather than bright overhead light.

The bulb is rated at Energy Rating E under current UK/EU labelling, which places it in the mid-range for LED efficiency. The 2700K colour temperature produces a warm yellowish-white tone similar to halogen or incandescent light, rather than the cooler blue-white of daylight-temperature LEDs. The 15-year lifespan claim is based on 3 hours of use per day, which equates to approximately 16,000 hours of rated life. The bulb is non-dimmable and will not function correctly with dimmer switches.

Is this bulb dimmable?

No. This bulb is not compatible with dimmer switches. Fitting it to a dimmed circuit will cause flickering, buzzing or failure to light. If you need a dimmable golf ball bulb, use the site filters to find dimmable alternatives.

What does B15 mean?

B15 is the small bayonet cap (SBC), with a 15mm diameter base and two pins that slot and twist into the socket. It's smaller than the standard B22 bayonet cap and common in UK decorative lighting, bathroom mirrors and older ceiling fittings.

How bright is 470 lumens?

470 lumens is equivalent to a traditional 40W incandescent bulb. It provides ambient light suitable for bedside lamps, decorative wall sconces and multi-bulb chandeliers, but is not bright enough for task lighting like reading or kitchen worktops on its own.

What colour is 2700K warm white?

2700K produces a warm yellowish-white light similar to traditional incandescent and halogen bulbs. It's warmer than 3000K (neutral white) and much warmer than 4000K-6500K daylight temperatures, making it suitable for living rooms, bedrooms and hospitality settings where a cosy tone is preferred.