GU10 LED Bulb 4.9W 345lm Non-Dimmable - Cool White 4000K - Eveready

This is a single GU10 LED spotlight bulb rated at 4.9W, giving 345 lumens at 4,000K. That colour temperature is a clean, neutral white: brighter and crisper than the yellow of a traditional halogen, without tipping into the blue of a daylight lamp. The retail pack rates it as a replacement for a 50W conventional spot, so the light you get back is close to what the old halogen gave while the power drawn drops by roughly nine tenths. The cap is the standard GU10 twist and lock type, with two stubby pins on a white body.

GU10 is the fitting used in most mains voltage downlights, track heads and spotlight bars, so this drops straight into a kitchen ceiling, a run of recessed lights over a worktop, a hallway or a living room track. Check the old bulb before you order: a GU10 has two thick pins that twist a quarter turn into the holder, while an MR16 has two thin push fit pins and runs from a transformer. The beam is a wide 100 degrees on the pack, which spreads light across a surface rather than picking out one object, so a row of them gives even cover instead of scalloped pools.

This lamp is not dimmable. On a dimmer circuit it will flicker, buzz or simply refuse to strike, so pair it with an ordinary switch or choose a dimmable spot instead. It runs on 220 to 240V mains at 50/60Hz and carries an IP20 rating, which means no protection against water and dry indoor positions only. The energy label supplied for this bulb shows class F at 4kWh per 1000 hours. The pack prints a 10 year, 10,000 hour lamp life and more than 10,000 on and off cycles, useful on a hall or stair light that gets switched often. Each listing is one bulb, and the minimum order is five.

Will this fit my existing downlights?

If the old bulb has two thick pins that twist a quarter turn into the holder, it is a GU10 and this will fit. Thin push fit pins mean an MR16, which is a different lamp.

Can I use it on a dimmer switch?

No. This bulb is not dimmable, so on a dimmer it may flicker, buzz or fail to light. Fit it to an ordinary on and off switch, or choose a dimmable spot instead.

How does 4,000K cool white compare with warm white?

At 4,000K the light reads as a clean neutral white. It looks crisper than a 2,700K or 3,000K warm white and shows colours and surfaces more plainly, which suits worktops and work areas.

Is 345 lumens enough to replace a 50W halogen spot?

The pack rates this bulb as a 50W conventional replacement, and the colour rendering index printed on the pack is above 80, so colours hold up well against the halogen it stands in for.

Does it need a driver or transformer?

No. GU10 lamps run directly from 220 to 240V mains at 50/60Hz, so the bulb goes straight into the holder with no extra gear.

How many do I have to buy?

Each listing is a single bulb. The minimum order is five, sold in multiples of five, so a five bulb order covers a typical run of kitchen downlights.