E27 (ES) LED GLS Bulb 9.5W 1050lm Non-Dimmable - Cool White 4000K

This is a general purpose GLS bulb from Energizer: the familiar pear shaped lamp with an E27 screw cap, which is the larger of the two screw sizes used in UK homes. It draws 9.5W and puts out 1050 lumens, and the retail pack gives it as a 75W replacement, so it belongs in the sockets you want properly bright rather than in a quiet corner lamp. The outer bulb is white and diffusing rather than clear, so the light spreads evenly and the LED inside does not show as hard bright points through a thin or pale shade.

The colour temperature is 4000K, a cool white that reads as neutral and clean rather than yellow. It suits kitchens, utility rooms, garages, workshops, home offices and stairwells, anywhere you are looking at detail or working with your hands. It is worth deciding this at room level: 4000K next to a 2700K warm white bulb in the same pendant or on the same landing will look noticeably bluer, so change the pair together. Any fitting that takes an E27 cap will take this bulb, from a ceiling rose or pendant to a floor lamp or a shade based wall light. Check the old bulb for a coarse screw thread about 27mm across before ordering.

There is no dimming here: the pack marks it non-dimmable, so wire it to an ordinary on and off switch and keep dimmer circuits for a lamp built for them. The energy rating is E and the pack prints a 15 year lifespan. The manufacturer does not state an IP rating. Each box holds one bulb, and the minimum order is 12, sold in multiples of 12. It sits alongside our wider range of Energizer LED bulbs in B15 (SBC), GU10 and 2G11 fittings, including candle shapes in both warm white 2700K and cool white 4000K.

Will this fit my lamp or ceiling fitting?

It has an E27 cap, also written as ES, which is the larger screw thread of about 27mm across. If your old bulb pushes and twists rather than screwing in, it is a bayonet cap and this one will not fit.

How bright is 9.5W in practice?

It gives 1050 lumens, and the pack puts that at a 75W replacement, so it is a main room brightness rather than a bedside level. Judge LED bulbs on lumens, not watts, when you compare two of them.

What does 4000K cool white actually look like?

It is a neutral, slightly crisp white with none of the yellow cast of 2700K. Whites stay white and colours read accurately, which is why it works over worktops, benches and desks.

Can I put it on a dimmer switch?

No. It is non-dimmable, so on a dimmer circuit it may flicker, buzz or fail early. Use a standard on and off switch, or choose a bulb built for dimming instead.

How long should it last?

The retail pack prints a 15 year lifespan, which is calculated from a typical daily run time rather than continuous use. Running it in a fully enclosed fitting will shorten that in practice.

How many bulbs do I receive?

Each box contains a single bulb. The minimum order on this listing is 12, sold in multiples of 12, so you receive twelve individually boxed bulbs at the lowest quantity.