Energizer 5W Dimmable LED GLS Filament Bulb E27 2700K Warm White

The Energizer 5W LED GLS filament bulb delivers 470 lumens of 2700K warm white light through an E27 Edison screw base. The visible LED filament strips inside a clear glass envelope replicate the appearance of traditional incandescent bulbs while consuming 5W to replace a 40W halogen or incandescent equivalent. The bulb is fully dimmable when paired with compatible LED dimmer switches.

Designed for use in table lamps, pendant fittings, wall lights and bare-bulb installations where the filament is visible, the bulb suits residential living rooms, bedrooms, dining rooms and hospitality settings. The 2700K colour temperature produces a warm amber-toned light similar to traditional tungsten bulbs, making it well-suited to rooms where a relaxed atmosphere is preferred over task lighting. The 320-degree beam angle provides wide light distribution across a room.

The clear glass envelope measures 60mm in diameter and 109mm in height, matching the classic GLS (General Lighting Service) shape that fits most standard lampshades and fittings. At 30g, the bulb is lighter than the incandescent equivalent it replaces, reducing strain on pendant cable and lampshade rings. The Energy Rating E reflects current UK energy labelling standards introduced in 2021, where ratings now run from A (most efficient) to G, with most LED bulbs falling in the D-F range.

Energizer rates this bulb for a 15-year lifespan under typical domestic use patterns (average 3 hours per day), reducing the frequency of replacement compared to halogen or incandescent alternatives. The dimmable function allows brightness to be adjusted from full output down to a low glow, though performance varies depending on the specific dimmer model used — older trailing-edge dimmers designed for incandescent loads may cause flicker at low settings.

Is this bulb dimmable with all dimmers?

The bulb is dimmable, but compatibility depends on the dimmer model. Modern LED-compatible dimmers (leading-edge or trailing-edge rated for LED loads) work best. Older dimmers designed for incandescent bulbs may cause flicker or buzzing at low brightness settings.

What's the actual light output compared to old bulbs?

The 470-lumen output is equivalent to a 40W incandescent bulb. For reference, a traditional 60W incandescent produces around 700 lumens, while a 100W produces roughly 1,400 lumens. This 5W Energizer bulb sits at the lower end for general ambient lighting.

Can it be used in enclosed fittings?

Yes. LED bulbs generate less heat than incandescent or halogen bulbs, so they can typically be used in fully enclosed fittings without overheating. However, enclosed spaces may reduce the bulb's lifespan slightly due to reduced airflow around the base.

What does Energy Rating E mean?

Under the UK energy labelling system introduced in 2021, ratings run from A (most efficient) to G (least efficient). Most LED bulbs now fall in the D-F range due to recalibrated standards. An E rating indicates moderate efficiency for LED technology, with room reserved above for future improvements.