E27 (ES) LED Filament GLS Bulb 4W 470lm - Warm White 2700K - Energizer

This is a clear glass GLS bulb with an E27 screw cap, the large thread fitting that most UK pendants and table lamps take. Four LED filament strips stand where the old coiled wire used to sit, so the light comes from lines you can read through the glass rather than from a solid white capsule. It draws 4W and gives 470 lumens at 2,700K, a warm white with the soft yellow cast of an old household bulb. The retail pack rates it as a 40W replacement, and the energy class is E.

Clear filament bulbs are for fittings that put the bulb on show: open shades, glass pendants, or a table lamp with an open topped shade. The beam angle is 320 degrees, so light travels up and sideways as well as down, which is what a hanging pendant needs if it is lighting a whole room rather than one pool on a table. Behind clear or ribbed glass the filaments read as bright lines; inside a dense fabric shade the same bulb behaves as a 470 lumen warm source. At 2,700K it settles well in living rooms, bedrooms, hallways and over a dining table. The IP rating is IP20, which means dry indoor positions.

It is not dimmable, so keep it off any circuit with a dimmer switch; a non-dimmable LED on a dimmer can flicker, buzz or fail early. On a plain switch it comes straight on at full output with no warm up. The pack prints a 15,000 hour life, which it also expresses as 15 years. One box holds a single bulb, and the minimum order is 12, sold in multiples of 12, which suits relamping a house or keeping spares. It sits alongside our wider range of LED bulbs, which also runs to B15 (SBC) candle and golf lamps and GU10 spotlights.

Will this replace the 40W bulb currently in my pendant?

If the old bulb has an E27 screw cap and the same GLS pear shape, yes. The pack rates this 4W lamp as a 40W replacement, so the light output should feel familiar.

Can I put it on a dimmer switch?

No. The specification gives it as non-dimmable, and the pack carries a non dimmable icon. On a dimmer it may flicker, buzz or shorten its life, so use a standard on and off switch.

How bright is 470 lumens in a real room?

It is a comfortable single source for a hallway, a bedside lamp or a small pendant. For a main living room light most people prefer two or more fittings at this output.

What does 2,700K warm white actually look like?

It is the yellow toned white of a traditional household bulb, easy on the eye in the evening and kind to wood, brick and warm paint colours.

How many bulbs do I receive?

Each box contains one bulb. The minimum order on this listing is 12, sold in multiples of 12, so the smallest purchase is twelve individually boxed bulbs.

Does it need a warm up time before reaching full brightness?

No. LED filament lamps reach their full output the moment the switch is flicked, with none of the slow start that older energy saving lamps were known for.