E27 (ES) LED GLS Bulb 4.2W 470lm Non-Dimmable - Warm White 2700K

This is a 4.2W LED bulb in the GLS shape, the rounded pear form that has been the standard household bulb for generations. It takes an E27 screw cap, often written as ES, so it twists straight into the fitting rather than pushing and turning like a bayonet cap. If the old bulb you are replacing has a threaded screw base about 27mm across, E27 is what you want. The outer surface is plain white and diffused, so the light leaves the bulb evenly rather than as a cluster of bright points, and it gives 470 lumens at 2700K.

The pack rates it as a replacement for a 40W incandescent, which is the everyday level of light most people are used to in a table lamp, a bedside lamp or a pendant over a landing. At 2700K the light reads warm and slightly yellow, close to the old filament bulbs, and it sits comfortably in a living room or bedroom where a cooler white would feel clinical. The 240 degree beam angle means light spreads almost all the way around the bulb rather than forward only, so an open shade, a fabric drum or a glass pendant is filled rather than lit in one direction.

This bulb is not dimmable, so pair it with an ordinary on and off switch; fitted to a dimmer circuit it may flicker, buzz or fail early. It carries an energy rating of E, and at IP20 it has no protection against water, which keeps it to ordinary dry indoor fittings. The pack prints a 15,000 hour lifespan and a 15 year figure based on typical household use. Each box holds one bulb, and the minimum order is 12, sold in multiples of 12, which suits replacing a run of lamps in one go. We stock LED candle, golf and GU10 bulbs alongside it.

How do I know if my lamp takes an E27 cap?

Look at the base of the old bulb. E27, also sold as ES, is a threaded screw base roughly 27mm across that turns clockwise into the holder. If yours has two small pins and pushes in before twisting, that is a bayonet cap and this bulb will not fit.

Is 470 lumens as bright as my old 40W bulb?

The pack rates this 4.2W lamp as a 40W replacement, so in practice it gives a comparable amount of light for a fraction of the power. It suits reading lamps, bedside lamps and smaller pendants rather than lighting a whole large room on its own.

Can I put it on a dimmer switch?

No. The specification and the pack both state non-dimmable, so use it on a standard on and off switch. On a dimmer circuit a non-dimmable LED can flicker, hum or have its life shortened, even if it appears to work at first.

What does 2700K warm white actually look like?

It is a soft, slightly golden white, very close to the colour of an old filament bulb. It flatters wood, warm paint colours and skin tones, and reads as restful in the evening, where 4000K or 6500K would feel much crisper and more workmanlike.

Does the 240 degree beam angle matter for my shade?

Yes, and in a good way. Light comes out over a wide arc rather than in a narrow cone, so an open drum, a coolie shade or a clear pendant is lit fairly evenly and the ceiling picks up some light rather than staying dark.

How many bulbs do I receive?

Each box holds one bulb. The minimum order on this listing is 12, sold in multiples of 12, so a typical order gives you a dozen boxes of one bulb each, which is handy if you are relamping a whole floor.