GU10 LED Spotlight Bulb 5.5W 350lm - Cool White 4000K

This is a 5.5W GU10 LED spotlight from Energizer, giving 350 lumens of cool white light at 4,000K through a 36 degree beam. The body is the familiar pressed glass reflector with a ridged skirt and the two stubby pins of a GU10 cap, so it drops straight into the fitting most UK ceiling spots and track heads already use. The retail pack rates it as a replacement for a 50W halogen spot, which is the size most older downlights were built around.

Cool white at 4,000K is a cleaner, slightly blue-leaning light than the 2,700K and 3,000K warm whites, and it suits places where you want to see clearly rather than settle in: kitchen ceilings, utility rooms, a home office, a garage workbench or a run of spots over a worktop. The narrow 36 degree cone puts most of the light where it is pointed rather than washing the whole room, so it works well for picking out a work surface, a shelf or a painting. If you are replacing one lamp in an existing run, match the colour temperature of the others or the difference will be obvious.

The specification lists an IP20 rating and a G energy rating, and the pack prints a 15 year lifespan based on 15,000 hours of use. On dimming the two printed sources disagree: the retail pack is marked non dimmable, while the manufacturer's published specification lists the lamp as dimmable, so we would put it on a plain switch rather than a dimmer. Each listing is a single bulb, and the minimum order is 12, sold in multiples of 12, which makes it sensible for doing a whole ceiling at once. It sits alongside our wider range of LED bulbs from the same maker, including a 3.6W GU10 in warm white 3000K and B15 candle bulbs.

Will this fit my existing GU10 downlights?

Yes, if the old bulb had two small pins that push in and twist a quarter turn to lock. GU10 runs on mains voltage, so no transformer is involved, unlike a 12V MR16 spot.

Is 350 lumens bright enough to replace my old halogen spots?

The pack rates it as a 50W halogen replacement, which is the most common size in older ceiling spots. Light from the narrow cone is concentrated, so it reads brighter directly below than the figure suggests.

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

It is a clean, neutral to slightly cool light with no yellow cast, good for kitchens, workshops and task areas. Warm white at 2,700K or 3,000K is the cosier choice for living rooms.

Can I use this on a dimmer switch?

We would not, until the conflict is settled. The retail pack is marked non dimmable while the manufacturer's specification lists the lamp as dimmable, so fit it on an ordinary switch.

How wide is the beam, and what does it suit?

The beam is 36 degrees, a narrow cone that throws a defined pool of light rather than filling a room. It works well over worktops, islands, shelving and artwork.

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

Each unit is one bulb in its own box. The minimum order is 12 units, sold in multiples of 12, which covers most full ceiling replacements in one go.