E27 LED Opal GLS Bulb 4.2W 470lm Non-Dimmable - Warm White 2700K

This is a standard GLS light bulb in LED form, with the familiar E27 screw cap that UK shops also label ES. It draws 4.2W and produces 470 lumens, and the retail pack quotes it as a replacement for a 40W incandescent bulb. The bulb is opal white rather than clear, so the light source behind it is diffused and the output spreads evenly instead of showing bright points. Colour temperature is 2700K, the warm, slightly yellow light that older tungsten bulbs gave, and the energy rating is E.

The GLS profile is the shape most pendant fittings, table lamps and floor lamps were designed around, so it sits properly inside a drum or coolie shade without the neck dropping below the rim. Check the old bulb before ordering: E27 measures 27mm across the threads, which is what the number means, and the smaller E14 will not engage in the same holder. At 470 lumens this is a gentle level of light, suited to a bedside lamp, a hall pendant or a pair of side lamps flanking a sofa. Where one central fitting has to light a whole room on its own, a brighter lamp will serve you better.

This lamp is not dimmable, so put it on an ordinary on and off switch rather than a dimmer circuit; a non-dimmable LED on a dimmer can flicker, buzz or fail early. The pack prints a 15,000 hour lifespan, which at three hours of use a day is a useful margin for a fitting that needs a ladder to reach. Each box holds one bulb, and the minimum order is 12, sold in multiples of 12, so it is worth ordering when you are refitting a whole house or keeping spares for a rental. Our other LED bulbs cover B15 (SBC) candle fittings and GU10 spotlights if other rooms need matching.

Will this fit a lamp that takes a bayonet bulb?

No. This has an E27 screw cap, which threads in. A bayonet bulb pushes in and twists, so the holder has to match.

How bright is 470 lumens next to the bulb I am replacing?

The pack rates it as a 40W replacement, so it suits table lamps, bedside lamps and hall pendants rather than a single main light for a large room.

Can I use it on a dimmer switch?

No. It is specified as non-dimmable, so wire it to an ordinary switch. On a dimmer it may flicker or buzz and can fail well before its rated hours.

What does 2700K warm white look like once it is lit?

It is the soft, slightly yellow tone people associate with old tungsten bulbs, and it flatters wood, warm paint colours and skin tones in the evening.

Is an IP rating given for this bulb?

It has no stated IP rating, so it is for dry rooms only. Treat it as an ordinary indoor lamp.

How many bulbs do I receive?

Each box holds a single bulb. The minimum order on this listing is 12 boxes, sold in multiples of 12, so you receive 12 bulbs at a time.