Eveready 4.9W LED GLS Bulb E27 Cool White 4000K Non-Dimmable

The Eveready 4.9W LED GLS bulb is an E27 screw-fit replacement for traditional 40W incandescent bulbs, producing 470 lumens at 4000K cool white. The GLS (General Lighting Service) shape is the classic pear-shaped bulb profile that fits most standard table lamps, ceiling pendants and wall lights expecting a conventional bulb form. The 220° beam angle provides wide light dispersion for general room lighting rather than directional spotlighting.

Designed for kitchens, bathrooms, utility rooms, home offices and hallways where neutral white light supports task visibility without the warmth of 2700K domestic lamps, the 4000K colour temperature gives a clean, alert quality to the light. The bulb operates on 220-240V mains and is non-dimmable, providing consistent output from switch-on. The 10-year rated lifespan assumes average domestic use of 2.7 hours per day.

The bulb measures 60mm diameter by 110mm height, matching the footprint of traditional GLS incandescent bulbs so it fits existing shades and fittings without modification. The opal polycarbonate outer diffuses the internal LED array to give an even glow across the bulb surface rather than visible LED points. The F energy rating reflects the current EU energy label scale introduced in 2021, where ratings run from A (most efficient) to G.

Is this bulb dimmable?

No. This is a non-dimmable LED bulb and will not work correctly with dimmer switches. Attempting to use it with a dimmer may cause flickering or damage to the bulb. For dimmable E27 GLS bulbs, search for models specifically marked as dimmable in the Niori catalogue.

What is the colour temperature and where should I use it?

The 4000K colour temperature is cool white, producing neutral-toned light that suits kitchens, bathrooms, utility rooms and home offices where task visibility matters. It feels more alert and clinical than the 2700K warm white typically used in living rooms and bedrooms.

What does 470 lumens equate to in old bulb terms?

470 lumens is roughly equivalent to a traditional 40W incandescent bulb. This is suitable for small to medium rooms, bedside lamps, hallway pendants and secondary lighting rather than primary room illumination in larger spaces.

What does the F energy rating mean?

The F rating uses the EU energy label scale introduced in 2021, which runs from A (most efficient) to G (least efficient). LED bulbs typically sit in the D-F range on this scale. The rating reflects the bulb's efficiency relative to the total light output, not its absolute running cost, which remains low at 4.9W.