Energizer LED Capsule Bulb G9 4.2W Clear Dimmable - Cool White 4000K

This is a G9 LED capsule, the small two-pin lamp that slots into compact fittings rather than screwing or twisting in. It draws 4.2W and gives 470 lumens at 4,000K, a cool white with a clean, slightly blue-leaning cast rather than the yellow of an older halogen. Energizer prints a 40W replacement figure on the pack, which is the halogen capsule most of these fittings originally took, and a 15 year lifespan beside it. The energy rating is E.

G9 lamps live in the fittings that need a light source barely larger than a thumb: multi-arm ceiling pendants, crystal and glass wall lights, cooker hoods, lit mirrors and small table lamps where the lamp itself is on show. The 4,000K output suits kitchens, home offices, utility rooms and anywhere you want edges and colours to read clearly; if the room already runs on 2,700K warm white lamps, mixing the two in one fitting will show. Where several G9 lamps sit in one fixture, change them all together so the colour stays even.

It is dimmable, so it can go on an existing dimmer, though a lamp this small draws so little power that one on its own may sit below the minimum load of an older mains dimmer; a trailing-edge LED dimmer, with more than one lamp on the circuit, is the reliable arrangement. The pack quotes 470 lumens in a sphere, meaning the figure counts light thrown in every direction rather than forwards only. Each unit is a single boxed lamp, and the listing is sold in multiples of 12, so the smallest order is a dozen. It sits alongside our wider range of LED bulbs in other caps, including B15 and GU10.

Which fittings take a G9 lamp?

G9 is a two-pin push-fit cap with a looped pin at each side, used in compact pendants, wall lights, cooker hoods and small table lamps. Pull the old lamp straight out and check the pins match before ordering.

Will it work on my existing dimmer?

The lamp is dimmable, but at 4.2W it draws very little. An older mains dimmer built for halogen may need several lamps on the circuit to reach its minimum load; a trailing-edge LED dimmer is the safer pairing.

Is 470 lumens enough to replace a 40W halogen capsule?

The pack gives 40W as the replacement figure, so the light output is intended to stand in for a 40W halogen G9 while drawing 4.2W instead.

What does 4,000K cool white actually look like?

It is a neutral, crisp white rather than the creamy yellow of 2,700K. Colours and edges read clearly, which suits kitchens and work areas, but it will look noticeably cooler beside warm white lamps.

Does the light go in all directions?

The pack quotes 470 lumens in a sphere, meaning the figure is measured all around the lamp rather than in a forward beam, so it works well inside diffusers and open multi-arm fittings.

Does the manufacturer state an IP rating?

No IP rating is given in the specification or printed on the retail pack, so we do not publish one. Check the rating of the fitting the lamp goes into instead.