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Energizer 3.4W MR16 LED Bulb GU5.3 - Cool White 4000K Non-Dimmable

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

The Energizer 3.4W MR16 is an LED spotlight bulb with a GU5.3 bi-pin base, delivering 345 lumens of cool white 4000K light through a focused 36° beam angle. The bulb measures 50mm high by 45mm diameter and runs on standard 12V low-voltage circuits, making it a direct replacement for 35W halogen MR16 bulbs in existing track lighting, recessed downlights and display lighting fixtures.

Designed for task lighting and accent applications, the 4000K colour temperature sits between neutral white and daylight, providing clear visibility without the warmer amber tone of 3000K bulbs or the clinical blue-white of 6000K. This makes it well-suited to kitchens, home offices, retail display lighting, and anywhere concentrated light is needed for detail work or highlighting objects. The narrow 36° beam concentrates light into a defined pool rather than flooding an entire room.

The LED construction provides a rated 15-year lifespan based on average domestic use, outlasting halogen equivalents by approximately 10-12 years and reducing replacement frequency and maintenance. At 3.4W the bulb draws approximately 90% less power than the 35W halogen it replaces while delivering comparable lumens, reducing running costs on circuits with multiple bulbs. The bulb is non-dimmable and rated Energy Class E under the current UK/EU energy labelling scheme.

The compact 45mm reflector diameter fits standard MR16 housings without modification, and the GU5.3 pin spacing matches the older GX5.3 designation used on some older fittings. The bulb operates on 12V AC or DC, requiring a compatible transformer or LED driver where mains voltage is being stepped down.

Specification
Weight (KG) 0.03
Width (mm) 45
Height (mm) 50
Depth (mm) 45
Wattage 3.4W
Lumen 345
Lamp Shape Spot
Lamp Base MR16 / GU5.3
Energy Rating E
Kelvin 4,000K
Colour Temperature Cool White
Dimmable No
Beam Angle 36
LED or Halogen LED
Frequently Asked

Is this bulb dimmable?

No. This Energizer MR16 is non-dimmable and should not be paired with dimmer switches. Attempting to dim a non-dimmable LED can cause flickering, reduced lifespan or failure.

What voltage does it run on?

The bulb operates on 12V AC or DC, which means it requires a low-voltage transformer or LED driver to step down from mains 230V. Most existing halogen MR16 circuits already have the correct transformer in place.

What's the difference between 4000K and 3000K?

4000K is cool white with a neutral, slightly blue-toned light that appears cleaner and brighter. 3000K is warm white with a softer, amber-toned light closer to traditional incandescent. 4000K suits task areas like kitchens and offices, while 3000K suits living rooms and bedrooms.

How does the 36° beam angle affect light spread?

A 36° beam is considered narrow or medium-narrow, concentrating light into a defined circular pool approximately 1.2m wide when the bulb is 2m from the surface. This suits accent lighting, highlighting artwork, or task lighting where focused light is needed rather than general room illumination.

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.

Light source

Takes standard bulbs

Takes standard MR16 bulbs, so you choose the brightness and colour to suit the room.

Ordering with us

Free delivery over £99

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 3.4W MR16 is an LED spotlight bulb with a GU5.3 bi-pin base, delivering 345 lumens of cool white 4000K light through a focused 36° beam angle. The bulb measures 50mm high by 45mm diameter and runs on standard 12V low-voltage circuits, making it a direct replacement for 35W halogen MR16 bulbs in existing track lighting, recessed downlights and display lighting fixtures.

    Designed for task lighting and accent applications, the 4000K colour temperature sits between neutral white and daylight, providing clear visibility without the warmer amber tone of 3000K bulbs or the clinical blue-white of 6000K. This makes it well-suited to kitchens, home offices, retail display lighting, and anywhere concentrated light is needed for detail work or highlighting objects. The narrow 36° beam concentrates light into a defined pool rather than flooding an entire room.

    The LED construction provides a rated 15-year lifespan based on average domestic use, outlasting halogen equivalents by approximately 10-12 years and reducing replacement frequency and maintenance. At 3.4W the bulb draws approximately 90% less power than the 35W halogen it replaces while delivering comparable lumens, reducing running costs on circuits with multiple bulbs. The bulb is non-dimmable and rated Energy Class E under the current UK/EU energy labelling scheme.

    The compact 45mm reflector diameter fits standard MR16 housings without modification, and the GU5.3 pin spacing matches the older GX5.3 designation used on some older fittings. The bulb operates on 12V AC or DC, requiring a compatible transformer or LED driver where mains voltage is being stepped down.

    Specification
    Weight (KG) 0.03
    Width (mm) 45
    Height (mm) 50
    Depth (mm) 45
    Wattage 3.4W
    Lumen 345
    Lamp Shape Spot
    Lamp Base MR16 / GU5.3
    Energy Rating E
    Kelvin 4,000K
    Colour Temperature Cool White
    Dimmable No
    Beam Angle 36
    LED or Halogen LED
    Frequently Asked

    Is this bulb dimmable?

    No. This Energizer MR16 is non-dimmable and should not be paired with dimmer switches. Attempting to dim a non-dimmable LED can cause flickering, reduced lifespan or failure.

    What voltage does it run on?

    The bulb operates on 12V AC or DC, which means it requires a low-voltage transformer or LED driver to step down from mains 230V. Most existing halogen MR16 circuits already have the correct transformer in place.

    What's the difference between 4000K and 3000K?

    4000K is cool white with a neutral, slightly blue-toned light that appears cleaner and brighter. 3000K is warm white with a softer, amber-toned light closer to traditional incandescent. 4000K suits task areas like kitchens and offices, while 3000K suits living rooms and bedrooms.

    How does the 36° beam angle affect light spread?

    A 36° beam is considered narrow or medium-narrow, concentrating light into a defined circular pool approximately 1.2m wide when the bulb is 2m from the surface. This suits accent lighting, highlighting artwork, or task lighting where focused light is needed rather than general room illumination.

    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.