E27 (ES) LED GLS Bulb 12.6W 1521lm Dimmable - Cool White 4000K

A 12.6W LED bulb with an E27 screw cap, the large screw fitting that most UK pendants, table lamps and standard lamps take. The GLS shape is the familiar rounded pear outline of the old household bulb, so it sits inside a shade the same way its filament predecessor did. It puts out 1521 lumens, which the pack rates as a 100W replacement, at a colour temperature of 4000K. The pack calls that cool white: a clean, neutral light without the yellow cast of a 2700K lamp. The pack also marks the bulb as dimmable.

Cool white at this brightness suits rooms where you are doing something rather than settling down. Kitchens and utility rooms are the obvious homes for it, along with home offices, workshops, garages, landings and stairwells where you want to see the top step clearly. In a living room it reads as brisk rather than cosy, so it works better over a desk or a worktop than in a soft evening scheme. The white diffusing body spreads the output across the whole envelope, which makes it an easy choice for open pendants and bare holders where a clear filament lamp would show a hot spot.

If you intend to dim it, use a dimmer made for LED loads and check that dimmer's minimum wattage. At 12.6W a single bulb can fall below the floor of an older mains dimmer built for filament lamps, which shows up as flicker or as a very short useful travel on the dial. On a plain switch it simply runs at full output. The pack prints a 15 year lifespan and an energy class of E. Each box holds one bulb and the minimum order is 12, sold in multiples of 12, so it is worth allowing for the fittings you will relamp next.

Will this fit my existing lamp?

It fits any E27 holder, also sold as ES or Edison screw. Take out the old bulb and look at the base: if it screws in and the thread is roughly 27mm across, this is the right cap.

What sort of dimmer do I need?

Use a dimmer rated for LED loads, usually trailing edge, and check its minimum wattage. One 12.6W bulb is a very small load for an older filament dimmer, so several lamps on the same circuit often behave better than one.

How bright is 1521 lumens against my old bulb?

The pack rates it as a 100W replacement, so it is a full brightness main light rather than a background lamp. Expect noticeably more output than the 60W and 75W bulbs most ceiling fittings once carried.

What does 4000K look like once it is lit?

It is a neutral white, closer to daylight than to candlelight. Whites read as white and colours stay true, which helps at a worktop or a desk but can feel cool in a lounge.

Does the manufacturer state an IP rating?

No. The manufacturer does not print an ingress protection figure for this lamp, so none is given in the specification above. Nothing further about protection against water or dust is claimed here.

How many bulbs do I receive?

Each box contains one bulb. The minimum order on this listing is 12 boxes, sold in multiples of 12, so a single order brings you twelve bulbs.