E27 LED Filament GLS Bulb 5W 550lm Dimmable - Warm White 2700K

A 5W LED filament bulb in the classic GLS shape, with an E27 screw cap and 550 lumens of warm white light at 2700K. The clear glass shows the filament lines rather than hiding them, which is the point of a lamp like this: it is meant to be looked at. The pack rates it as a 40W replacement, so it covers the job most ordinary household bulbs do. Light spreads across 320 degrees, near enough all round, reaching the ceiling and walls as well as the surface below.

E27 is the larger of the two screw caps in common UK use, sometimes written as ES. If you are unsure which you have, take the old bulb out and measure the metal thread: E27 measures 27mm across, the smaller E14 measures 14mm. Standard pendants, floor lamps, table lamps and larger wall fittings usually take it. Because the filament is the decorative part, the bulb earns its place in open shades, glass lanterns, caged pendants and anywhere it hangs bare over a table. At 2700K the light reads as a soft yellow white, close to the old incandescent warmth, which suits sitting rooms, bedrooms and dining rooms. IP20 means dry indoor positions only.

The bulb is dimmable. Check that your dimmer is rated for LED loads and look at its minimum load, because a single 5W lamp can sit below what an older dimmer needs to run steadily; two or three on the same circuit usually settle it. The energy class is E, and the pack prints a 15 year lifespan based on 15,000 hours. Each box holds one bulb, and the listing is sold in multiples of 12, so the smallest order is 12 boxes. We also list LED candle bulbs on the smaller B15 (SBC) cap and a 3.6W GU10 bulb.

How do I tell whether my lamp takes an E27 cap?

E27 is the wider screw cap, measuring 27mm across the metal thread. Unscrew the old bulb and measure it; the narrower screw cap you may have is E14, at 14mm.

How bright is 550 lumens in practice?

It is close to the output of an old 40W incandescent bulb, which is comfortable for a table lamp, a bedside light or a hallway pendant, rather than a single main light in a large kitchen.

Will it work on my dimmer switch?

The bulb is dimmable. A trailing edge dimmer rated for LED loads gives the smoothest result, and it is worth checking the dimmer's minimum load, as one 5W bulb is a very small load.

What does 2700K warm white actually look like?

A soft yellow white, the tone most people associate with old filament bulbs. It flatters wood, warm paint colours and skin tones, and reads as restful in the evening.

Can I run it with no shade over it?

Yes. The glass is clear and the straight filament lines are meant to be seen, so it suits open shades, glass lanterns, caged pendants and a bare flex over a table.

How many bulbs do I receive?

Each box holds a single bulb, and the listing is sold in multiples of twelve, so the smallest order brings twelve individually boxed bulbs.