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Energizer 4.2W GU10 Dimmable LED Bulb - Warm White 3000K

£199
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Description

The Energizer 4.2W GU10 is a dimmable LED spotlight bulb rated at 450 lumens output with a 3000K warm white colour temperature. The GU10 twist-and-lock base fits standard UK downlight fittings and ceiling spotlights without requiring an adapter or transformer. At 4.2W power draw, the bulb replaces a 40W halogen equivalent while consuming approximately 90% less energy.

Designed for residential and commercial downlighting where variable brightness is needed, the bulb works with most leading-edge and trailing-edge dimmer switches. Dimming range runs from approximately 10% to 100% brightness depending on the dimmer model, allowing the light level to be adjusted from subtle accent lighting to full task brightness. The 3000K warm white tone suits living rooms, dining areas, bedrooms and hospitality settings where a softer, less clinical light is preferred over cooler daylight tones.

The rated 15-year lifespan assumes 3 hours daily use and translates to approximately 15,000 hours total running time before the LED degrades to 70% of initial output. The bulb runs cooler than halogen equivalents, reducing heat build-up in ceiling voids and enclosed downlight housings. Energy rating E reflects the efficiency gain over traditional halogen bulbs while acknowledging that newer ultra-efficient LED designs have since pushed ratings higher.

The bulb body is constructed from aluminium and thermoplastic polymer, with the LED chip mounted behind a frosted polycarbonate lens that diffuses the beam to reduce glare. Beam angle is typically 36-40° for focused spotlight effect rather than flood coverage. Flicker-free operation at full brightness and when dimmed makes the bulb suitable for areas where screen work or detailed tasks are performed.

Specification
Wattage 4.2W
Lumen 450lm
Lamp Shape GU10
Lamp Base GU10
Energy Rating E
Kelvin 3,000K
Colour Temperature Warm White
Dimmable Yes
LED or Halogen LED
Frequently Asked

Is this bulb compatible with all dimmer switches?

The Energizer GU10 works with most modern leading-edge and trailing-edge dimmers. Older resistive dimmers designed for incandescent bulbs may cause flickering or limited dimming range. If you experience issues, check your dimmer is rated for LED loads.

What is the beam angle?

GU10 spotlight bulbs typically deliver a 36-40° focused beam. This makes them suited to directional downlighting, accent lighting and task lighting rather than wide-area room illumination.

How does 3000K compare to other colour temperatures?

3000K is classified as warm white and produces a soft, slightly amber-toned light similar to traditional halogen. It is warmer than 4000K neutral white or 6000K daylight, making it more comfortable for residential living spaces and areas where relaxation is prioritised over task visibility.

Can this replace a 50W halogen GU10?

At 450 lumens, this bulb is closer to a 40W halogen equivalent. For direct 50W halogen replacement, consider a 5-6W GU10 LED rated at 500-550 lumens.

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 4.2W GU10 is a dimmable LED spotlight bulb rated at 450 lumens output with a 3000K warm white colour temperature. The GU10 twist-and-lock base fits standard UK downlight fittings and ceiling spotlights without requiring an adapter or transformer. At 4.2W power draw, the bulb replaces a 40W halogen equivalent while consuming approximately 90% less energy.

    Designed for residential and commercial downlighting where variable brightness is needed, the bulb works with most leading-edge and trailing-edge dimmer switches. Dimming range runs from approximately 10% to 100% brightness depending on the dimmer model, allowing the light level to be adjusted from subtle accent lighting to full task brightness. The 3000K warm white tone suits living rooms, dining areas, bedrooms and hospitality settings where a softer, less clinical light is preferred over cooler daylight tones.

    The rated 15-year lifespan assumes 3 hours daily use and translates to approximately 15,000 hours total running time before the LED degrades to 70% of initial output. The bulb runs cooler than halogen equivalents, reducing heat build-up in ceiling voids and enclosed downlight housings. Energy rating E reflects the efficiency gain over traditional halogen bulbs while acknowledging that newer ultra-efficient LED designs have since pushed ratings higher.

    The bulb body is constructed from aluminium and thermoplastic polymer, with the LED chip mounted behind a frosted polycarbonate lens that diffuses the beam to reduce glare. Beam angle is typically 36-40° for focused spotlight effect rather than flood coverage. Flicker-free operation at full brightness and when dimmed makes the bulb suitable for areas where screen work or detailed tasks are performed.

    Specification
    Wattage 4.2W
    Lumen 450lm
    Lamp Shape GU10
    Lamp Base GU10
    Energy Rating E
    Kelvin 3,000K
    Colour Temperature Warm White
    Dimmable Yes
    LED or Halogen LED
    Frequently Asked

    Is this bulb compatible with all dimmer switches?

    The Energizer GU10 works with most modern leading-edge and trailing-edge dimmers. Older resistive dimmers designed for incandescent bulbs may cause flickering or limited dimming range. If you experience issues, check your dimmer is rated for LED loads.

    What is the beam angle?

    GU10 spotlight bulbs typically deliver a 36-40° focused beam. This makes them suited to directional downlighting, accent lighting and task lighting rather than wide-area room illumination.

    How does 3000K compare to other colour temperatures?

    3000K is classified as warm white and produces a soft, slightly amber-toned light similar to traditional halogen. It is warmer than 4000K neutral white or 6000K daylight, making it more comfortable for residential living spaces and areas where relaxation is prioritised over task visibility.

    Can this replace a 50W halogen GU10?

    At 450 lumens, this bulb is closer to a 40W halogen equivalent. For direct 50W halogen replacement, consider a 5-6W GU10 LED rated at 500-550 lumens.

    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.