Energizer LED GLS E27 4W Filament Non-Dimmable - Very Warm White 2200K

This is a 4W LED filament bulb in the traditional GLS shape, the rounded pear outline that household bulbs have carried for a century. It takes an E27 screw cap, the larger of the two common screw fittings, and the glass is tinted gold rather than left clear, so the straight filament rods inside sit against a warm amber ground. The Energizer pack gives 440 lumens at 2,200K, a colour it calls vintage, and quotes the bulb as a replacement for a 35W incandescent.

Because the filament is the point of a bulb like this, it suits fittings that leave the glass on show: a bare flex pendant, an open shade, a cage or lantern, or a table lamp whose shade is narrow enough to let the bulb read. At 440 lumens it is not the bulb to light a whole kitchen from a single centre fitting; it earns its place where you want a pool of light rather than a working level, so think snugs, bedsides, hallways and rows of pendants used in the evening. A colour temperature of 2,200K sits well below the 2,700K of a soft white bulb, close to candlelight, and the gold tint pushes it further still. White paint reads creamy under it and warm woods look deeper.

There is no dimming here: the pack marks it non dimmable, so keep it off circuits with a dimmer switch, where a non dimmable lamp can flicker or buzz. The energy label carries class E and 4kWh per 1,000 hours, and the pack prints a 15,000 hour lifespan, or 15 years at the usage the maker assumes. The IP20 rating means indoor, dry positions only. Each box holds one bulb, and this line is sold in multiples of twelve, so the minimum order is 12. It sits within our wider range of LED bulbs in E27, B15 and GU10 fittings.

How do I know my lamp takes an E27 cap?

Look at the old bulb. E27 is a screw cap measuring 27mm across the threaded metal base, the larger of the two common screw sizes; the smaller one is E14.

Can I put it on a dimmer switch?

No. The pack marks it non dimmable, so wire it to a plain on and off switch. Running a non dimmable lamp on a dimmer can cause flicker, buzzing or a shortened life.

How much light does 440 lumens actually give?

The pack quotes it as a 35W incandescent replacement, so it is a gentle output suited to atmosphere, a bedside or a multi lamp pendant rather than a single main room light.

What does 2,200K look like once it is lit?

Noticeably warmer and more golden than an ordinary warm white bulb at 2,700K, closer to candle colour, and the gold tinted glass adds to that amber cast.

Will it suit an enclosed or outdoor lantern?

The IP20 rating gives no protection against water, so use it indoors in dry positions. Open or well ventilated indoor fittings also help any LED lamp run cooler and last longer.

How many bulbs do I receive?

One bulb per box. The line is supplied in multiples of 12, so the smallest order is 12 boxes, which works well when relamping a run of pendants at once.