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3.5W LED Emergency Downlight 5500K - White (Maintained or Non-Maintained)

£3399
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Description

The Knightsbridge EMPOWER4 is a 3.5W LED emergency downlight with an integrated lithium (LiFePO4) battery providing a minimum 3-hour runtime in emergency mode. The fitting operates in either maintained (constantly on), non-maintained (on only during power failure), or switched configurations, selected during installation. A separate green LED charge indicator shows battery status.

Designed for corridors, stairwells, fire escape routes and commercial spaces requiring emergency lighting compliance, the downlight cuts into a 45mm ceiling aperture and sits flush with a 60mm diameter white polycarbonate bezel. The fitting requires an 80mm minimum void above the ceiling and includes a corridor lens accessory that narrows the 140° beam into an elongated spread pattern, concentrating light along the length of hallways rather than dispersing it in a circular pattern.

The 3.5W LED produces 140 lumens at 5500K daylight colour temperature in both mains and emergency modes, maintaining consistent brightness during power cuts. The lithium battery chemistry provides a longer lifespan and faster recharge compared to older NiCd or NiMH technologies, and the battery pack is pre-wired to the driver for quicker installation. A manual emergency test button allows periodic functionality checks without isolating the mains supply.

The IP20 rating suits dry internal applications, and the Class II double-insulated construction eliminates the need for an earth connection. The polycarbonate bezel resists impact better than glass equivalents, reducing damage during installation or maintenance. The 0.35m cable run from the driver to the LED module provides enough slack for routing within typical ceiling voids without requiring additional junction boxes.

Specification
Diameter 60 mm
Length 183 mm
Recessed Depth 32 mm
Minimum Void 80 mm
Cut-out Diameter 45 mm
Construction Polycarbonate
Finish White
Class II
IP Rating IP20
Primary Voltage 230V 50Hz
Cable Length 0.35 m
Emergency Maintained / Non-maintained / Switched
Lamp Technology LED
Lamp Included Yes
Dimmable No
L70B50 30000
Beam Angle 140
CCT 5500 K
Light Colour Daylight
Lumens 140 lm
Lumens (Em. mode) 140 lm
Wattage 3.5
Efficacy 40 lm/W
CRI >70
Warranty 5
Downloads

Product Specification Sheet

Frequently Asked

What is the difference between maintained and non-maintained emergency lighting?

Maintained mode keeps the LED constantly on during normal operation and switches to battery power during a mains failure. Non-maintained mode leaves the LED off until a power cut occurs, then switches to battery operation. The EMPOWER4 can be wired for either mode depending on the circuit configuration used during installation.

How long does the battery last in emergency mode?

The lithium (LiFePO4) battery provides a minimum 3-hour runtime at 140 lumens when the mains supply fails. The battery recharges automatically when mains power is restored, and the green LED indicator shows charge status.

What ceiling void depth is required?

The fitting requires a minimum 80mm void above the ceiling to accommodate the driver unit and battery pack. The recessed depth of the LED module itself is 32mm, with the 60mm bezel sitting flush to the ceiling surface.

What is the corridor lens accessory for?

The corridor lens (included in the box) narrows the standard 140° circular beam into an elongated pattern that directs light along the length of a hallway rather than dispersing it in all directions. This concentrates lumens where they are needed in corridor applications and reduces wasted light.

Shipping & Returns

Free worldwide delivery

Free worldwide delivery on all orders over £99. International orders for third-party brand products may be subject to an additional courier surcharge based on volumetric weight, particularly on larger lighting fixtures — if a surcharge applies, our team will email you with the amount before dispatch and you can proceed or cancel for a full refund. See full delivery terms.

Returns

30-day returns window from delivery. As all our products are electrical or lighting goods, returned items must be inspected and recertified by a qualified electrician before resale — the cost of this inspection (25–40% of the item value) is deducted from your refund. Customers pay return shipping. Made-to-order, special-order and clearance items cannot be returned. See full returns policy.

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    Description

    The Knightsbridge EMPOWER4 is a 3.5W LED emergency downlight with an integrated lithium (LiFePO4) battery providing a minimum 3-hour runtime in emergency mode. The fitting operates in either maintained (constantly on), non-maintained (on only during power failure), or switched configurations, selected during installation. A separate green LED charge indicator shows battery status.

    Designed for corridors, stairwells, fire escape routes and commercial spaces requiring emergency lighting compliance, the downlight cuts into a 45mm ceiling aperture and sits flush with a 60mm diameter white polycarbonate bezel. The fitting requires an 80mm minimum void above the ceiling and includes a corridor lens accessory that narrows the 140° beam into an elongated spread pattern, concentrating light along the length of hallways rather than dispersing it in a circular pattern.

    The 3.5W LED produces 140 lumens at 5500K daylight colour temperature in both mains and emergency modes, maintaining consistent brightness during power cuts. The lithium battery chemistry provides a longer lifespan and faster recharge compared to older NiCd or NiMH technologies, and the battery pack is pre-wired to the driver for quicker installation. A manual emergency test button allows periodic functionality checks without isolating the mains supply.

    The IP20 rating suits dry internal applications, and the Class II double-insulated construction eliminates the need for an earth connection. The polycarbonate bezel resists impact better than glass equivalents, reducing damage during installation or maintenance. The 0.35m cable run from the driver to the LED module provides enough slack for routing within typical ceiling voids without requiring additional junction boxes.

    Specification
    Diameter 60 mm
    Length 183 mm
    Recessed Depth 32 mm
    Minimum Void 80 mm
    Cut-out Diameter 45 mm
    Construction Polycarbonate
    Finish White
    Class II
    IP Rating IP20
    Primary Voltage 230V 50Hz
    Cable Length 0.35 m
    Emergency Maintained / Non-maintained / Switched
    Lamp Technology LED
    Lamp Included Yes
    Dimmable No
    L70B50 30000
    Beam Angle 140
    CCT 5500 K
    Light Colour Daylight
    Lumens 140 lm
    Lumens (Em. mode) 140 lm
    Wattage 3.5
    Efficacy 40 lm/W
    CRI >70
    Warranty 5
    Downloads

    Product Specification Sheet

    Frequently Asked

    What is the difference between maintained and non-maintained emergency lighting?

    Maintained mode keeps the LED constantly on during normal operation and switches to battery power during a mains failure. Non-maintained mode leaves the LED off until a power cut occurs, then switches to battery operation. The EMPOWER4 can be wired for either mode depending on the circuit configuration used during installation.

    How long does the battery last in emergency mode?

    The lithium (LiFePO4) battery provides a minimum 3-hour runtime at 140 lumens when the mains supply fails. The battery recharges automatically when mains power is restored, and the green LED indicator shows charge status.

    What ceiling void depth is required?

    The fitting requires a minimum 80mm void above the ceiling to accommodate the driver unit and battery pack. The recessed depth of the LED module itself is 32mm, with the 60mm bezel sitting flush to the ceiling surface.

    What is the corridor lens accessory for?

    The corridor lens (included in the box) narrows the standard 140° circular beam into an elongated pattern that directs light along the length of a hallway rather than dispersing it in all directions. This concentrates lumens where they are needed in corridor applications and reduces wasted light.

    Shipping & Returns

    Free worldwide delivery

    Free worldwide delivery on all orders over £99. International orders for third-party brand products may be subject to an additional courier surcharge based on volumetric weight, particularly on larger lighting fixtures — if a surcharge applies, our team will email you with the amount before dispatch and you can proceed or cancel for a full refund. See full delivery terms.

    Returns

    30-day returns window from delivery. As all our products are electrical or lighting goods, returned items must be inspected and recertified by a qualified electrician before resale — the cost of this inspection (25–40% of the item value) is deducted from your refund. Customers pay return shipping. Made-to-order, special-order and clearance items cannot be returned. See full returns policy.