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Energizer 4W GU10 Dimmable LED Bulb - Cool White 4000K

£199
The RRP is the manufacturer's recommended retail price of the item.
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Description

The Energizer 4W GU10 is a dimmable LED spotlight bulb delivering 450 lumens at 4000K cool white, designed as a direct replacement for 40W halogen GU10 bulbs. The GU10 twist-and-lock base fits all standard UK spotlight fittings, recessed downlights, and track lighting systems without modification.

Cool white at 4000K sits between warm white (2700K-3000K) and daylight (5000K+), providing neutral illumination suited to kitchens, bathrooms, home offices, and retail display where clarity and colour accuracy matter more than atmospheric warmth. The 450-lumen output from a 4W draw gives the same light level as a traditional 40W halogen while reducing energy consumption by 90%.

Dimmer compatibility allows the bulb to be paired with most LED-compatible trailing-edge dimmers, enabling light levels to be adjusted from full brightness down to around 10% depending on the dimmer model used. The rated 15,000-hour lifespan at average domestic use (3 hours per day) translates to approximately 13-14 years before replacement, significantly longer than halogen equivalents which typically last 2,000-3,000 hours.

Specification
Wattage 4W
Lumen 450lm
Lamp Shape GU10
Lamp Base GU10
Energy Rating E
Kelvin 4,000K
Colour Temperature Cool White
Dimmable Yes
LED or Halogen LED
Frequently Asked

Is this bulb dimmable with all dimmers?

The bulb is designed to work with most LED-compatible trailing-edge dimmers. Older leading-edge dimmers designed for incandescent or halogen bulbs may cause flickering or buzzing. Check your dimmer's compatibility with LED loads before installation, or contact us for specific dimmer recommendations.

What's the difference between 4000K cool white and warm white?

4000K cool white produces a neutral, crisp light similar to daylight through a window on an overcast day, making colours appear more accurate and surfaces brighter. Warm white (2700K-3000K) has a yellow-orange tone closer to traditional incandescent bulbs, creating a cosier atmosphere. Cool white suits task-focused rooms like kitchens and offices; warm white suits living rooms and bedrooms.

How long does the bulb last?

Energizer rates this bulb at 15,000 hours. At typical domestic use of 3 hours per day, that equals approximately 13-14 years before the bulb needs replacing, compared to 2-3 years for a halogen GU10.

Does it fit standard GU10 spotlight fittings?

Yes. The GU10 twist-and-lock base is a standard UK fitting used in recessed downlights, surface-mounted spotlights, and track lighting. The bulb is a direct swap for any existing GU10 halogen without wiring changes.

Shipping & Returns

Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

To arrange a return, call us on 020 8149 5199 or use our contact page.

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Every product arrives brand new with the full manufacturer warranty. Found it cheaper elsewhere? Ask us about a price match.

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Takes standard bulbs

Takes standard GU10 bulbs, so you choose the brightness and colour to suit the room.

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Free delivery on orders over £99, in the UK and worldwide. Easy returns within 14 days, subject to our returns policy. Full manufacturer warranty included.

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    Description

    The Energizer 4W GU10 is a dimmable LED spotlight bulb delivering 450 lumens at 4000K cool white, designed as a direct replacement for 40W halogen GU10 bulbs. The GU10 twist-and-lock base fits all standard UK spotlight fittings, recessed downlights, and track lighting systems without modification.

    Cool white at 4000K sits between warm white (2700K-3000K) and daylight (5000K+), providing neutral illumination suited to kitchens, bathrooms, home offices, and retail display where clarity and colour accuracy matter more than atmospheric warmth. The 450-lumen output from a 4W draw gives the same light level as a traditional 40W halogen while reducing energy consumption by 90%.

    Dimmer compatibility allows the bulb to be paired with most LED-compatible trailing-edge dimmers, enabling light levels to be adjusted from full brightness down to around 10% depending on the dimmer model used. The rated 15,000-hour lifespan at average domestic use (3 hours per day) translates to approximately 13-14 years before replacement, significantly longer than halogen equivalents which typically last 2,000-3,000 hours.

    Specification
    Wattage 4W
    Lumen 450lm
    Lamp Shape GU10
    Lamp Base GU10
    Energy Rating E
    Kelvin 4,000K
    Colour Temperature Cool White
    Dimmable Yes
    LED or Halogen LED
    Frequently Asked

    Is this bulb dimmable with all dimmers?

    The bulb is designed to work with most LED-compatible trailing-edge dimmers. Older leading-edge dimmers designed for incandescent or halogen bulbs may cause flickering or buzzing. Check your dimmer's compatibility with LED loads before installation, or contact us for specific dimmer recommendations.

    What's the difference between 4000K cool white and warm white?

    4000K cool white produces a neutral, crisp light similar to daylight through a window on an overcast day, making colours appear more accurate and surfaces brighter. Warm white (2700K-3000K) has a yellow-orange tone closer to traditional incandescent bulbs, creating a cosier atmosphere. Cool white suits task-focused rooms like kitchens and offices; warm white suits living rooms and bedrooms.

    How long does the bulb last?

    Energizer rates this bulb at 15,000 hours. At typical domestic use of 3 hours per day, that equals approximately 13-14 years before the bulb needs replacing, compared to 2-3 years for a halogen GU10.

    Does it fit standard GU10 spotlight fittings?

    Yes. The GU10 twist-and-lock base is a standard UK fitting used in recessed downlights, surface-mounted spotlights, and track lighting. The bulb is a direct swap for any existing GU10 halogen without wiring changes.

    Shipping & Returns

    Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

    Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

    To arrange a return, call us on 020 8149 5199 or use our contact page.