Energizer 7.3W Dimmable GLS LED Bulb E27 4000K Cool White

The Energizer 7.3W dimmable GLS LED bulb uses an E27 Edison screw base and delivers 806 lumens at 4000K cool white, making it a direct replacement for a traditional 60W incandescent or halogen bulb while consuming 88% less energy. The GLS (General Lighting Service) shape is the standard bulb profile that fits most table lamps, ceiling pendants, wall lights and enclosed shades without modification.

Designed for living rooms, home offices, kitchens and bedrooms where clear task visibility matters, the 4000K colour temperature sits between warm white (2700K-3000K) and daylight (5000K-6500K), producing a neutral white light that renders colours accurately without the yellow cast of warm bulbs or the blue tint of daylight bulbs. The dimmable design allows brightness adjustment from full 806-lumen output down to around 10% intensity, depending on the dimmer switch used.

The bulb carries an E energy rating under the revised 2021 EU/UK energy labelling regulations, which recalibrated all ratings downward to account for LED efficiency gains. An E rating for LED bulbs indicates good efficiency relative to older incandescent technology. Energizer rates this bulb for a 15-year lifespan at average domestic use (approximately 15,000 hours), reducing replacement frequency compared to halogen equivalents that typically last 2,000 hours.

The E27 fitting is the most common screw base in the UK domestic market and also widely used across Europe. The bulb operates on standard 220-240V mains voltage without requiring a transformer or driver, making it suitable for direct retrofit into existing light fittings.

Is this bulb compatible with all dimmer switches?

The bulb is rated as dimmable, but compatibility depends on the specific dimmer model. Older dimmer switches designed for incandescent or halogen bulbs may cause flickering, buzzing or limited dimming range with LED bulbs. For best results, use a trailing-edge or universal dimmer switch rated for LED loads. If your existing dimmer causes issues, contact us for dimmer switch recommendations.

What does 4000K cool white look like?

4000K produces a neutral white light that sits between the warm yellow glow of traditional incandescent bulbs (2700K) and the blue-tinted daylight of 6000K+ bulbs. It renders colours accurately without adding a warm or cool cast, making it suitable for kitchens, home offices and task lighting where clarity matters.

How long does the bulb last?

Energizer rates this bulb for 15,000 hours of use. At an average household use of 3 hours per day, that equates to approximately 13-14 years before needing replacement, significantly longer than halogen equivalents which typically last 2,000 hours.

Can it be used in enclosed light fittings?

Yes. The GLS shape and E27 base are designed to fit standard enclosed pendants, table lamp shades and ceiling fixtures. LED bulbs generate less heat than halogen equivalents, reducing the risk of overheating in enclosed housings.