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

This is a G9 capsule bulb: the small two pin format that pushes straight into its holder rather than screwing or twisting in. It draws 4.2W and gives 470 lumens, and the retail pack rates it as a 40W replacement, so the light is much the same as the capsule it takes over from. The colour temperature is 4000K, a cool white sitting between the yellow of a halogen capsule and the blue edge of a daylight lamp, and the beam angle is 300 degrees, so light leaves in almost every direction rather than in a cone.

G9 holders turn up in compact wall lights, small pendants and multi arm ceiling fittings, where the lamp has to be short enough to hide behind a shade or inside a glass diffuser. Cool white at 4000K suits rooms where you want to see clearly: a kitchen, a hallway, a landing or a home office. It reads as clean rather than cosy, so it works better with white paint, chrome and pale worktops than with deep colours. If several capsules share one fitting, run them all at the same colour temperature, because one 4000K lamp among warm white neighbours is very noticeable.

It is not dimmable, so give it a plain on and off switch. On a dimmer circuit a non dimmable LED can flicker or buzz and will not last as long, so choose a dimmable lamp if your wall light is on a rotary dial. The pack prints a 15 year lifespan, and the energy rating is E. One unit is a single bulb, and the minimum order is 12 in multiples of 12, which suits relamping a whole fitting at once. It sits alongside other cool white 4000K LED bulbs we list, including B15 candle and 2G11 PLL types.

How do I tell whether my fitting takes a G9 lamp?

A G9 lamp has two looped wire pins set close together and pushes straight into the holder. Pull your old capsule out and compare the pins before ordering.

Can I use this on a dimmer switch?

No. The pack marks it non dimmable, so it needs a standard on and off switch; a dimmer can cause flicker, buzzing or early failure.

How bright is 470 lumens next to my old halogen capsule?

The pack rates it as a 40W replacement, and 470 lumens is a close match for a 40W G9 halogen, so the fitting should look much the same.

What does 4000K cool white actually look like?

It is a clean, neutral white with no yellow cast, brighter feeling than a 2700K warm white lamp and softer than a 6500K daylight one.

Is an IP rating given for this lamp?

The manufacturer does not state an IP rating for it, so no rating is claimed; the fitting the lamp sits in carries the rating that governs where it can go.

How many bulbs do I receive, and what is the minimum order?

Each unit is one bulb. The minimum order is 12 units, sold in multiples of 12, so a set of spares comes as standard.