Energizer 12.6W Dimmable GLS LED Bulb B22 Cool White 4000K

The Energizer 12.6W GLS LED bulb delivers 1521 lumens of 4000K cool white light from a standard B22 bayonet cap fitting. The 12.6W consumption replaces a traditional 100W incandescent bulb, reducing energy use by roughly 87% while maintaining equivalent brightness. The bulb is dimmable when paired with compatible LED dimmer switches.

Designed for kitchens, home offices, utility rooms and hallways where crisp, neutral light supports task visibility, the 4000K colour temperature sits between warm white and daylight, providing clear illumination without the yellow cast of 2700K bulbs or the clinical brightness of 6000K+ daylight bulbs. The GLS (General Lighting Service) shape fits ceiling pendants, table lamps, wall lights and floor lamps that accept standard-sized bulbs.

The B22 bayonet cap fits by pushing and twisting into the lamp holder, the standard fitting for most UK residential and commercial lighting. Dimming range depends on the specific dimmer model installed — test compatibility before purchasing multiple bulbs if dimming is critical to your application. The bulb carries an Energy Rating of E under current UK regulations, reflecting the higher output compared to lower-wattage models.

Is this bulb compatible with all dimmer switches?

The bulb is rated as dimmable, but performance depends on the specific dimmer model installed. LED-compatible trailing-edge dimmers generally provide the smoothest dimming range. Older rotary or leading-edge dimmers designed for incandescent bulbs may cause flickering or a restricted dimming range. Test one bulb before purchasing multiple units if dimming is essential.

What does 4000K cool white look like in practice?

4000K sits between warm white (2700K-3000K) and daylight (5000K-6500K). It produces a neutral white light without the yellow tone of warm white or the blue-white cast of daylight bulbs. This makes it well-suited to kitchens, bathrooms, offices and utility spaces where colour accuracy and task visibility matter more than creating a warm ambient atmosphere.

What's the equivalent incandescent wattage?

The 1521 lumens output is roughly equivalent to a 100W traditional incandescent bulb. The actual brightness depends on the fitting and shade design, but in open or clear-glass fittings the light level is comparable to what a 100W filament bulb would produce.

How long does the bulb last?

Energizer rates this LED bulb with a 15-year lifespan under typical domestic use (approximately 15,000 hours). Actual lifespan varies with operating hours per day, ambient temperature, and whether the bulb is frequently switched on and off or left running continuously.