GX24d LED PLT Bulb 6W 840lm Non-Dimmable - Cool White 4000K

This is a 6W LED replacement for a two pin compact fluorescent PL lamp, fitted with a GX24d cap. Two slim tubes sit on a white moulded base, and the base ends in two flat pins that slot straight into a GX24d holder. It gives 840 lumens at 4000K, which the pack calls cool white, and the pack rates it as a replacement for an 18W lamp. Because the light source is LED rather than a fluorescent tube, it comes on at full output the moment the switch is thrown, with none of the warm up a compact fluorescent needs on a cold morning.

PL lamps are workhorses rather than decorative pieces. The GX24d holder turns up in recessed downlights, wall mounted bulkheads, stairwell and corridor fittings, and in the drum fittings used across offices, receptions, garages and workshops. The 4000K output sits at the neutral end of white: cleaner and more alert than the yellow of a 2700K lamp, without tipping into the blue cast of a 6500K daylight tube. That makes it a sensible choice where people need to see clearly, such as a stock room, a landing, a workbench or a shared hallway, and it keeps colours on paper and packaging honest.

This lamp is not dimmable, so keep it on a plain switched circuit rather than a dimmer plate. The energy rating is D, and the pack prints a 30 year lifespan, though it does not print the daily hours that figure assumes. Each box holds one lamp and the minimum order is 10, sold in multiples of 10, which suits relamping a whole run of corridor or office fittings in one go rather than one at a time. Before ordering, take the old lamp out and check the cap: GX24d carries two pins, and the four pin GX24q version will not sit in the same holder.

How do I know my fitting takes a GX24d lamp?

Pull the old lamp out and look at the base. GX24d has two flat pins on a white plastic cap; the GX24q version of the same lamp family has four pins and will not seat in a two pin holder, so count the pins before you order.

How bright is 840 lumens in practice?

Lumens measure the light given out, and 840 is the working output of a small commercial fitting rather than a room's main pendant. The pack rates it against an 18W lamp, so expect similar brightness from the 6W LED.

What does 4000K cool white look like in a room?

It is a neutral white, noticeably crisper than the 2700K warm white used in living rooms and softer than 6500K daylight. It reads as clean and businesslike, which is why it is common in offices, corridors and work areas.

Can I put it on a dimmer?

No. The specification lists this lamp as not dimmable and the pack carries the non dimmable icon, so it should run on a plain switched circuit. A dimmer plate is not a suitable control for it.

Is an IP rating given for this lamp?

The manufacturer does not state an IP rating for this lamp, either in the specification or on the retail pack, so we do not publish one. The rating of the fitting it goes into is what governs where that fitting can be used.

How many do I have to buy?

Each box contains one lamp, and the minimum order is 10, sold in multiples of 10. That works out well if you are changing a run of identical fittings and want a spare or two on the shelf.