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Capsule LED Bulbs

Compact capsule LED bulbs on the G9 and G4 caps, the two small pin fittings used in desk lamps, pendants and accent fittings. Wattages run from 1.2W up to 4.9W, with output from 90lm to 530lm and colour temperatures spanning warm white at 2700K, through 3000K and cool white 4000K, to daylight at 6500K. Both dimmable and non-dimmable versions are stocked, with CRI80 and higher CRI90 options for truer colour.

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What a capsule bulb is

The capsule is one of the smallest bulb shapes you can buy, a stubby body just big enough to house the LED and its pins. It is the format used inside desk lamps, slim pendants and small accent fittings where there is little room to spare, so the bulb stays hidden behind a shade or diffuser and simply does the work of producing light.

Cap fittings

This range sits on the two small pin caps. G9 has a pair of looped pins set a short distance apart, while G4 uses two straight pins close together. Both push straight into the fitting rather than twisting or bayoneting, and the two are not interchangeable, so it is worth checking which one your lamp takes before you order.

Brightness and colour

Wattages here are low, reflecting how little power LED capsules need, with versions described as warm white at 2700K, cool white at 4000K and daylight at 6500K. Warm white suits bedside and living spaces, cool white works for kitchens and tasks, and daylight gives the crispest, whitest light. Both dimmable and non-dimmable models are listed, and some carry a higher CRI rating for truer-looking colour.

Where they are used

Because of their size, capsule bulbs turn up in fittings that need a compact source: under-shelf and cabinet lights, small wall fittings, reading lamps and decorative pendants with exposed sockets. The G4 versions in particular are common in low-clearance fixtures.

How to choose

Start with the cap your fitting needs, G9 or G4, then pick a colour temperature to match the room and decide whether you need dimming. If the bulb sits in an open fitting, warmer tones tend to feel more comfortable. Free UK delivery over £99, worldwide shipping.

Frequently Asked Questions

What is the difference between G9 and G4 capsule bulbs?
Both are small capsule fittings with two pins rather than a screw or bayonet cap. G9 has flat looped pins and runs on mains voltage, while G4 has two straight pins and is a 12V fitting, so check which your lamp or fitting takes before ordering.

Can I get a dimmable capsule bulb?
Yes. Dimmable G9 options run up to 4.9W, and there are dimmable G4 versions too. Non-dimmable bulbs are also stocked from 1.2W upward, so pick a dimmable bulb only if it is paired with a compatible dimmer.

Which colour temperature should I choose?
Warm white at 2700K gives a soft, cosy glow for living and bedroom fittings. 3000K is a touch brighter, 4000K cool white suits kitchens and workspaces, and 6500K daylight gives the crispest, whitest light.

What does the CRI rating mean here?
CRI measures how accurately a bulb renders colour against natural light. The range includes CRI80 bulbs for everyday use and higher CRI90 options where truer colour matters, such as over a dressing area or display shelf.

How bright are these capsule bulbs?
Output runs from 90lm on the lowest 1.2W G4 up to 530lm on a 4W G9, with most sitting around 150lm to 470lm. They are sized for accent and task fittings rather than lighting a whole room on their own.

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