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

£3399
The RRP is the manufacturer's recommended retail price of the item.
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Description

The Knightsbridge EMPOWER4BK is a 3.5W LED emergency downlight with an integrated LiFePO4 (lithium iron phosphate) battery providing a minimum 3-hour backup illumination at 140 lumens. The fitting operates in either maintained mode (permanently illuminated) or non-maintained mode (illuminates only on mains failure), selectable during installation. A separate green LED charge indicator shows battery status without opening the fitting.

Designed for commercial corridors, escape routes, stairwells and residential fire-safety compliance, the downlight recesses into ceilings with a minimum 80mm void depth behind a 45mm cut-out. The 60mm black polycarbonate bezel sits flush with the ceiling plane once installed. The fitting ships with a pre-wired battery pack and a corridor lens accessory in the box, giving a narrow beam pattern suited to long hallways where wider spread would waste light.

The 5500K daylight colour temperature provides high visual clarity for navigation during power outages, contrasting with the warmer 2700K-3000K ambient lighting typically used in residential and hospitality spaces. The IP20 rating limits the fitting to dry indoor locations. The polycarbonate construction and Class II double-insulated design mean no earth connection is required, simplifying installation on older wiring where earth availability may be inconsistent.

The LiFePO4 battery chemistry offers longer cycle life and better thermal stability than standard lithium-ion cells, with the L70B50 rating of 30,000 hours indicating the fitting retains 70% of initial light output after 30,000 hours of operation. A manual emergency test button on the driver allows periodic compliance testing without cutting mains power to the circuit.

Specification
Diameter 60 mm
Length 183 mm
Recessed Depth 32 mm
Minimum Void 80 mm
Cut-out Diameter 45 mm
Construction Polycarbonate
Finish Black
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

Product Manual

Frequently Asked

What is the difference between maintained and non-maintained mode?

In maintained mode the downlight remains permanently illuminated when mains power is present, switching to battery backup during a power cut. In non-maintained mode the downlight only illuminates when mains power fails. The mode is selected during installation via a switch on the driver.

How long does the battery last on a single charge?

The LiFePO4 battery provides a minimum 3 hours of emergency illumination at 140 lumens once fully charged. The green LED charge indicator shows when the battery has returned to full charge after a discharge event.

What ceiling void depth is required?

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

Can it be used in bathrooms?

No. The IP20 rating limits the fitting to dry indoor locations only. Bathrooms, kitchens and other moisture-prone areas require a minimum IP44 or IP65 rating depending on zone.

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 EMPOWER4BK is a 3.5W LED emergency downlight with an integrated LiFePO4 (lithium iron phosphate) battery providing a minimum 3-hour backup illumination at 140 lumens. The fitting operates in either maintained mode (permanently illuminated) or non-maintained mode (illuminates only on mains failure), selectable during installation. A separate green LED charge indicator shows battery status without opening the fitting.

    Designed for commercial corridors, escape routes, stairwells and residential fire-safety compliance, the downlight recesses into ceilings with a minimum 80mm void depth behind a 45mm cut-out. The 60mm black polycarbonate bezel sits flush with the ceiling plane once installed. The fitting ships with a pre-wired battery pack and a corridor lens accessory in the box, giving a narrow beam pattern suited to long hallways where wider spread would waste light.

    The 5500K daylight colour temperature provides high visual clarity for navigation during power outages, contrasting with the warmer 2700K-3000K ambient lighting typically used in residential and hospitality spaces. The IP20 rating limits the fitting to dry indoor locations. The polycarbonate construction and Class II double-insulated design mean no earth connection is required, simplifying installation on older wiring where earth availability may be inconsistent.

    The LiFePO4 battery chemistry offers longer cycle life and better thermal stability than standard lithium-ion cells, with the L70B50 rating of 30,000 hours indicating the fitting retains 70% of initial light output after 30,000 hours of operation. A manual emergency test button on the driver allows periodic compliance testing without cutting mains power to the circuit.

    Specification
    Diameter 60 mm
    Length 183 mm
    Recessed Depth 32 mm
    Minimum Void 80 mm
    Cut-out Diameter 45 mm
    Construction Polycarbonate
    Finish Black
    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

    Product Manual

    Frequently Asked

    What is the difference between maintained and non-maintained mode?

    In maintained mode the downlight remains permanently illuminated when mains power is present, switching to battery backup during a power cut. In non-maintained mode the downlight only illuminates when mains power fails. The mode is selected during installation via a switch on the driver.

    How long does the battery last on a single charge?

    The LiFePO4 battery provides a minimum 3 hours of emergency illumination at 140 lumens once fully charged. The green LED charge indicator shows when the battery has returned to full charge after a discharge event.

    What ceiling void depth is required?

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

    Can it be used in bathrooms?

    No. The IP20 rating limits the fitting to dry indoor locations only. Bathrooms, kitchens and other moisture-prone areas require a minimum IP44 or IP65 rating depending on zone.

    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.