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3.5W LED Emergency Downlight 3000K - Maintained or Non-Maintained

£3399
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Description

The Knightsbridge EMPOWER4W is a 3.5W LED emergency downlight with an integrated lithium iron phosphate (LiFePO4) battery providing a minimum 3-hour runtime when mains power fails. The fitting operates in either maintained mode (lit continuously under normal conditions and switching to battery during power loss) or non-maintained mode (only illuminating when mains power is lost), selected during installation. The integrated LED outputs 130 lumens at 3000K warm white in both normal and emergency modes.

Designed for stairwells, corridors, communal areas and commercial spaces requiring BS 5266 compliance, the fitting recesses into ceilings with an 80mm minimum void depth. The 45mm cut-out diameter suits standard ceiling apertures, and the shallow 32mm recessed depth allows installation in plasterboard ceilings without additional framing. A separate green LED charge indicator mounted on the driver unit confirms battery status without opening the ceiling void. The pre-wired battery pack connects via a single plug-in connector, reducing on-site installation time.

The polycarbonate construction carries an IP20 rating for internal dry locations and a Class II double-insulated design requiring no earth connection. A corridor lens accessory ships in the box, narrowing the 140° beam angle to direct light along narrow hallways and reducing glare at eye level. The manual emergency test button on the driver allows monthly function checks without isolating mains supply. The LiFePO4 battery chemistry provides a longer service life than traditional NiCd or NiMH cells, with the LED module rated to L70B50 at 30,000 hours and the complete unit backed by a 5-year warranty.

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 3000 K
Light Colour Warm White
Lumens 130 lm
Lumens (Em. mode) 130 lm
Wattage 3.5
Efficacy 35.9 lm/W
CRI >70
Warranty 5
Downloads

Product Specification Sheet

Frequently Asked

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

In maintained mode, the LED is lit continuously under normal mains supply and switches to battery during power loss. In non-maintained mode, the LED only illuminates when mains power fails. The mode is selected during installation by wiring configuration. Maintained mode is required in areas where occupants need continuous lighting; non-maintained is acceptable where occupants are familiar with exit routes.

How long does the battery last before replacement?

The LiFePO4 battery provides significantly longer service life than traditional NiCd or NiMH emergency lighting batteries, typically 4-5 years under normal charge-discharge cycling. The green LED charge indicator on the driver unit signals when the battery requires replacement.

What ceiling void depth is required?

A minimum 80mm void depth is required to accommodate the driver unit and battery pack. The fitting itself recesses only 32mm into the ceiling, but the additional components sit above the ceiling plane.

Can the corridor lens be retrofitted after installation?

Yes. The corridor lens clips onto the front of the downlight bezel without requiring the fitting to be removed from the ceiling. It narrows the beam to direct light along corridors and reduce glare at eye level.

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 EMPOWER4W is a 3.5W LED emergency downlight with an integrated lithium iron phosphate (LiFePO4) battery providing a minimum 3-hour runtime when mains power fails. The fitting operates in either maintained mode (lit continuously under normal conditions and switching to battery during power loss) or non-maintained mode (only illuminating when mains power is lost), selected during installation. The integrated LED outputs 130 lumens at 3000K warm white in both normal and emergency modes.

    Designed for stairwells, corridors, communal areas and commercial spaces requiring BS 5266 compliance, the fitting recesses into ceilings with an 80mm minimum void depth. The 45mm cut-out diameter suits standard ceiling apertures, and the shallow 32mm recessed depth allows installation in plasterboard ceilings without additional framing. A separate green LED charge indicator mounted on the driver unit confirms battery status without opening the ceiling void. The pre-wired battery pack connects via a single plug-in connector, reducing on-site installation time.

    The polycarbonate construction carries an IP20 rating for internal dry locations and a Class II double-insulated design requiring no earth connection. A corridor lens accessory ships in the box, narrowing the 140° beam angle to direct light along narrow hallways and reducing glare at eye level. The manual emergency test button on the driver allows monthly function checks without isolating mains supply. The LiFePO4 battery chemistry provides a longer service life than traditional NiCd or NiMH cells, with the LED module rated to L70B50 at 30,000 hours and the complete unit backed by a 5-year warranty.

    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 3000 K
    Light Colour Warm White
    Lumens 130 lm
    Lumens (Em. mode) 130 lm
    Wattage 3.5
    Efficacy 35.9 lm/W
    CRI >70
    Warranty 5
    Downloads

    Product Specification Sheet

    Frequently Asked

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

    In maintained mode, the LED is lit continuously under normal mains supply and switches to battery during power loss. In non-maintained mode, the LED only illuminates when mains power fails. The mode is selected during installation by wiring configuration. Maintained mode is required in areas where occupants need continuous lighting; non-maintained is acceptable where occupants are familiar with exit routes.

    How long does the battery last before replacement?

    The LiFePO4 battery provides significantly longer service life than traditional NiCd or NiMH emergency lighting batteries, typically 4-5 years under normal charge-discharge cycling. The green LED charge indicator on the driver unit signals when the battery requires replacement.

    What ceiling void depth is required?

    A minimum 80mm void depth is required to accommodate the driver unit and battery pack. The fitting itself recesses only 32mm into the ceiling, but the additional components sit above the ceiling plane.

    Can the corridor lens be retrofitted after installation?

    Yes. The corridor lens clips onto the front of the downlight bezel without requiring the fitting to be removed from the ceiling. It narrows the beam to direct light along corridors and reduce glare at eye level.

    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.