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3.5W LED Self-Test Emergency Downlight 5500K - Maintained or Non-Maintained Use

£4499
The RRP is the manufacturer's recommended retail price of the item.
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Description

The Knightsbridge EMPOWER4ST is a 3.5W LED self-test emergency downlight with an integrated LiFePO4 lithium battery providing a minimum 3-hour emergency runtime. The fitting operates in maintained mode (on continuously, switching to battery during mains failure) or non-maintained mode (lit only during mains failure), selectable during installation. The self-test function runs automatic periodic tests at pre-programmed intervals to verify battery condition and lamp function, eliminating manual testing schedules.

Designed for corridors, stairwells, escape routes and office spaces where building regulations require emergency lighting, the downlight sits in a 45mm ceiling cut-out with a 32mm recessed depth and requires an 80mm minimum void above the ceiling. The unit ships pre-wired with the battery pack and a separate green LED charge indicator, so installation involves wiring to the mains supply and setting the maintained/non-maintained mode via the switch on the driver. A corridor lens accessory is included in the box for installations where concentrated light throw is needed along narrow passages.

The white polycarbonate bezel houses a 140-lumen LED module at 5500K daylight colour temperature, delivering 40 lumens per watt on a 140-degree beam angle. The IP20 rating suits dry indoor locations. The Class II double-insulated construction means no earth connection is needed during installation. The LiFePO4 battery chemistry provides longer service life and more charge cycles than traditional NiCd or NiMH emergency batteries, with the LED module rated at 30,000 hours L70B50 (70% lumen maintenance at 50% failure rate).

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 mode?

In maintained mode, the downlight operates continuously on mains power and switches to battery during a mains failure. In non-maintained mode, the LED remains off during normal operation and illuminates only when mains power is lost. The mode is selected via a switch on the driver during installation.

How does the self-test function work?

The integrated self-test module automatically runs periodic checks of the battery charge level and lamp function at pre-programmed intervals. Test results are indicated by the separate green LED charge indicator. This replaces manual monthly and annual testing schedules required by older emergency lighting systems.

What ceiling void depth is required?

A minimum 80mm void above the ceiling is needed to accommodate the driver unit and battery pack. The downlight bezel itself recesses 32mm into the ceiling through a 45mm diameter cut-out.

Can this be used in bathrooms?

The IP20 rating limits this downlight to dry indoor locations. Bathrooms require IP44 or higher ratings depending on zone placement. For bathroom emergency lighting, choose an IP-rated alternative from the Knightsbridge range.

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 EMPOWER4ST is a 3.5W LED self-test emergency downlight with an integrated LiFePO4 lithium battery providing a minimum 3-hour emergency runtime. The fitting operates in maintained mode (on continuously, switching to battery during mains failure) or non-maintained mode (lit only during mains failure), selectable during installation. The self-test function runs automatic periodic tests at pre-programmed intervals to verify battery condition and lamp function, eliminating manual testing schedules.

    Designed for corridors, stairwells, escape routes and office spaces where building regulations require emergency lighting, the downlight sits in a 45mm ceiling cut-out with a 32mm recessed depth and requires an 80mm minimum void above the ceiling. The unit ships pre-wired with the battery pack and a separate green LED charge indicator, so installation involves wiring to the mains supply and setting the maintained/non-maintained mode via the switch on the driver. A corridor lens accessory is included in the box for installations where concentrated light throw is needed along narrow passages.

    The white polycarbonate bezel houses a 140-lumen LED module at 5500K daylight colour temperature, delivering 40 lumens per watt on a 140-degree beam angle. The IP20 rating suits dry indoor locations. The Class II double-insulated construction means no earth connection is needed during installation. The LiFePO4 battery chemistry provides longer service life and more charge cycles than traditional NiCd or NiMH emergency batteries, with the LED module rated at 30,000 hours L70B50 (70% lumen maintenance at 50% failure rate).

    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 mode?

    In maintained mode, the downlight operates continuously on mains power and switches to battery during a mains failure. In non-maintained mode, the LED remains off during normal operation and illuminates only when mains power is lost. The mode is selected via a switch on the driver during installation.

    How does the self-test function work?

    The integrated self-test module automatically runs periodic checks of the battery charge level and lamp function at pre-programmed intervals. Test results are indicated by the separate green LED charge indicator. This replaces manual monthly and annual testing schedules required by older emergency lighting systems.

    What ceiling void depth is required?

    A minimum 80mm void above the ceiling is needed to accommodate the driver unit and battery pack. The downlight bezel itself recesses 32mm into the ceiling through a 45mm diameter cut-out.

    Can this be used in bathrooms?

    The IP20 rating limits this downlight to dry indoor locations. Bathrooms require IP44 or higher ratings depending on zone placement. For bathroom emergency lighting, choose an IP-rated alternative from the Knightsbridge range.

    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.