GU10 LED Bulb 4.9W 345lm Non-Dimmable - Warm White 3000K, 4 Pack

This is a GU10 LED spotlight bulb from JCB, supplied four to a box. It draws 4.9W and gives 345 lumens of warm white light at 3000K, and the pack rates it as a replacement for a 50W halogen spotlight. The cap is the standard GU10 twist and lock type with two flat pins, so it drops straight into the recessed downlights and track heads already fitted in most UK homes, running from ordinary 220-240V mains. The body and lens face are white, and a diffused face spreads light more evenly than a clear one.

Warm white at 3000K is the tone most people want over a kitchen worktop, in a hallway or across a living room ceiling: it keeps the yellow warmth of the halogen lamps these usually replace rather than pushing towards the blue-white of a daylight bulb. At 345 lumens each, one bulb lights a small area rather than a whole room, so think in terms of four, six or eight heads across a ceiling for general light, or a shorter run picking out a shelf or an alcove. If you are changing only some of the bulbs above one room, change them all, or the difference in tone will show.

There is no dimming: the specification lists this lamp as non-dimmable, so give it a plain on and off switch. A non-dimmable LED on a dimmer circuit can flicker, buzz or fail early, so check what controls the circuit first. The pack prints a life of up to 10 years, and the energy rating is G. Its IP rating is IP20, which means no protection against water, so keep it to dry indoor positions. Each box holds four bulbs, and the minimum order is 12 boxes sold in multiples of 12. We also stock LED candle, golf and GLS bulbs in B22, B15 and E14 caps.

Will this fit my existing halogen spotlights?

If the old bulb has two flat pins that push in and twist a quarter turn to lock, it is a GU10 and this replaces it directly on mains voltage, with no transformer involved. A bulb with two thin round pins is an MR16 and will not fit.

How bright is 345 lumens in practice?

It is a modest output for one lamp, which is why the pack rates it against a 50W halogen spotlight rather than a bigger one. Several heads across a ceiling will light a kitchen or hallway comfortably; a single bulb suits a shelf, an alcove or a small area of worktop.

Can I use these on a dimmer switch?

No. The specification lists the lamp as non-dimmable, so it needs a plain on and off switch. Fitted to a dimmer circuit, a non-dimmable LED can flicker, buzz or fail well before its rated life, so check the wall switch before ordering.

What does 3000K warm white actually look like?

It is the soft yellow-toned white most people associate with older halogen downlights, warmer and more relaxed than a 4000K cool white and much warmer than a 6500K daylight lamp. It flatters wood, cream walls and warm paint colours.

Why is the energy rating G when this is an LED?

The label scale was rebased, and most compact LED spotlights now sit at the lower end of it. The rating compares lumens to watts on the new scale; at 4.9W for 345 lumens this still draws a fraction of the halogen lamp the pack says it replaces.

How many bulbs do I receive?

One unit of this listing is a box of four bulbs. The minimum order is 12 boxes, sold in multiples of 12, so the smallest quantity you can buy is 48 bulbs in total.