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5W GU10 Dimmable LED Bulb 4000K Cool White - 570lm

£299
The RRP is the manufacturer's recommended retail price of the item.
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Description

This Knightsbridge 5W GU10 LED bulb delivers 570 lumens of 4000K cool white light through a 40° beam angle, providing direct replacement for traditional 50W halogen GU10 spotlights. The SMD LED chip sits behind a clear glass lens with a polycarbonate body, giving the bulb a similar visual appearance to halogen when installed in downlights or track fittings.

Designed for recessed downlights, track lighting, and directional spotlights in kitchens, bathrooms (IP20 rated for zones outside shower enclosures), offices and retail spaces, the 4000K colour temperature produces a neutral white light that sits between warm white (2700K-3000K) and daylight white (5000K-6500K). The 40° beam provides focused illumination without the hard shadows of narrower 25° beams, making it suitable for general room lighting as well as accent lighting.

The bulb is dimmable when paired with compatible trailing-edge or leading-edge dimmers — dimmer compatibility varies by manufacturer, so testing before full installation across multiple fittings is recommended. At 5W draw versus 50W for equivalent halogen output, the LED reduces energy consumption by 90% and the L70B50 rating of 54,000 hours translates to approximately 25 years of use at 6 hours per day before the bulb drops to 70% of its original lumen output.

Specification
Diameter 50 mm
Height 52 mm
Construction Glass
Construction 2 & polycarbonate
IP Rating IP20
Primary Voltage 230V 50Hz
Diffuser Clear
Lamp Technology SMD LED
Lamp Base GU10
Lamp Included Yes
Dimmable Yes*
L70B50 54000
Energy Rating (Class) post 2021 SLR E
Beam Angle 40
CCT 4000 K
Light Colour Cool White
Lumens 570 lm
Wattage 5
Efficacy 111.69 lm/W
CRI >80
Warranty 3
Downloads

Product Specification Sheet

Frequently Asked

Is this bulb compatible with all dimmers?

The bulb works with most trailing-edge and leading-edge dimmers, but compatibility varies by dimmer manufacturer and model. Test one bulb with your existing dimmer before installing across multiple fittings. Some older rotary dimmers designed for halogen loads may cause flickering or limited dimming range with LED bulbs.

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

4000K produces a cool white light with a neutral tone that appears slightly blue-white compared to the warmer, more yellow-toned 3000K. 4000K is commonly used in kitchens, bathrooms and task lighting where clarity is prioritised over warmth. 3000K is preferred in living rooms and bedrooms for a softer, more relaxed atmosphere.

Can this be used in bathroom downlights?

The IP20 rating means the bulb is suitable for bathroom zones outside shower enclosures and bath surrounds (typically zone 3). For downlights directly above a bath or inside a shower enclosure, an IP65-rated bulb and fitting are required.

How does the 570 lumens compare to halogen?

570 lumens is approximately equivalent to a 50W halogen GU10 spotlight. The 5W LED draw reduces energy consumption by 90% while producing similar light output and beam spread.

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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Why Niori

Over 20 years lighting homes worldwide

We are a specialist lighting and mirror retailer with showrooms in Birmingham, Hong Kong and Dubai, shipping to customers around the world. Our own design team is here to help, from first idea to final fitting.

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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 GU10 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

    This Knightsbridge 5W GU10 LED bulb delivers 570 lumens of 4000K cool white light through a 40° beam angle, providing direct replacement for traditional 50W halogen GU10 spotlights. The SMD LED chip sits behind a clear glass lens with a polycarbonate body, giving the bulb a similar visual appearance to halogen when installed in downlights or track fittings.

    Designed for recessed downlights, track lighting, and directional spotlights in kitchens, bathrooms (IP20 rated for zones outside shower enclosures), offices and retail spaces, the 4000K colour temperature produces a neutral white light that sits between warm white (2700K-3000K) and daylight white (5000K-6500K). The 40° beam provides focused illumination without the hard shadows of narrower 25° beams, making it suitable for general room lighting as well as accent lighting.

    The bulb is dimmable when paired with compatible trailing-edge or leading-edge dimmers — dimmer compatibility varies by manufacturer, so testing before full installation across multiple fittings is recommended. At 5W draw versus 50W for equivalent halogen output, the LED reduces energy consumption by 90% and the L70B50 rating of 54,000 hours translates to approximately 25 years of use at 6 hours per day before the bulb drops to 70% of its original lumen output.

    Specification
    Diameter 50 mm
    Height 52 mm
    Construction Glass
    Construction 2 & polycarbonate
    IP Rating IP20
    Primary Voltage 230V 50Hz
    Diffuser Clear
    Lamp Technology SMD LED
    Lamp Base GU10
    Lamp Included Yes
    Dimmable Yes*
    L70B50 54000
    Energy Rating (Class) post 2021 SLR E
    Beam Angle 40
    CCT 4000 K
    Light Colour Cool White
    Lumens 570 lm
    Wattage 5
    Efficacy 111.69 lm/W
    CRI >80
    Warranty 3
    Downloads

    Product Specification Sheet

    Frequently Asked

    Is this bulb compatible with all dimmers?

    The bulb works with most trailing-edge and leading-edge dimmers, but compatibility varies by dimmer manufacturer and model. Test one bulb with your existing dimmer before installing across multiple fittings. Some older rotary dimmers designed for halogen loads may cause flickering or limited dimming range with LED bulbs.

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

    4000K produces a cool white light with a neutral tone that appears slightly blue-white compared to the warmer, more yellow-toned 3000K. 4000K is commonly used in kitchens, bathrooms and task lighting where clarity is prioritised over warmth. 3000K is preferred in living rooms and bedrooms for a softer, more relaxed atmosphere.

    Can this be used in bathroom downlights?

    The IP20 rating means the bulb is suitable for bathroom zones outside shower enclosures and bath surrounds (typically zone 3). For downlights directly above a bath or inside a shower enclosure, an IP65-rated bulb and fitting are required.

    How does the 570 lumens compare to halogen?

    570 lumens is approximately equivalent to a 50W halogen GU10 spotlight. The 5W LED draw reduces energy consumption by 90% while producing similar light output and beam spread.

    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.