GU10 LED Bulb 3.6W 345lm Dimmable - Daylight 6500K, 4 Pack

This is a GU10 LED spotlight rated at 3.6W, giving 345 lumens at 6500K. The colour temperature is the headline here: 6500K is daylight, a crisp blue-white with none of the yellow cast a warm white lamp gives, and it sits at the coolest point on the usual domestic scale. The beam is 36 degrees, and the pack describes the output as 345 lumens in a narrow cone. Energizer prints a 50W replacement figure on the box, so it stands in for an older 50W halogen spot. Four bulbs come in the box.

Daylight at 6500K suits places where you want to see clearly rather than settle in: a kitchen worktop, a garage or workshop ceiling, a utility room, a home office, a display cabinet, or a stairwell where a faithful white helps you judge colour properly. It is a poor match for a sitting room or a bedroom, where 2700K or 3000K reads far softer. Mixing colour temperatures along one ceiling looks untidy, so if you are replacing a single lamp in a row of four or five, it is worth doing the whole row at once.

The lamp is dimmable, so it will run on a dimmer, though LED loads are very low and an older halogen dimmer may buzz or refuse to strike at the bottom of its travel; a trailing edge LED dimmer is the reliable pairing. Energy rating is E. The pack prints a 15 year lifespan and a rated life of 15,000 hours. IP20 means indoor, dry positions only. Each box holds four bulbs, and the minimum order is 12 boxes, sold in multiples of 12. We also list a non-dimmable 3.6W GU10 in warm white 3000K if you want the softer colour instead.

Will this fit my existing spotlights?

It fits any GU10 holder. Check the old bulb has two stubby pins with rounded ends that twist and lock a quarter turn, rather than the two smooth push-in pins of a low voltage MR16, which will not accept this lamp.

What does 6500K daylight actually look like in a room?

It is a clean blue-white with no warmth in it, close to bright overcast sky. Good for seeing detail on a worktop or bench, and noticeably colder than the 2700K and 3000K lamps most people use in living rooms.

Which dimmer will it work with?

It is dimmable, and a trailing edge dimmer rated for LED loads is the safest choice. Four of these draw only 14.4W in total, which is below the minimum load many older halogen dimmers need to run smoothly.

How bright is 345 lumens against the halogen I am replacing?

The pack gives it as a 50W replacement, so expect output in the same region as a 50W halogen spot, concentrated into a 36 degree beam rather than spread across the whole ceiling.

How many bulbs do I get, and how many boxes must I buy?

One box contains four bulbs. The minimum order on this listing is 12 boxes, sold in multiples of 12, which works out at 48 bulbs per order.

How long should each bulb last?

The pack prints a 15 year lifespan based on a rated life of 15,000 hours. Actual life depends on how many hours a day the fitting runs and how well the ceiling void ventilates.