18W Outdoor CCT LED Bulkhead With Emergency - Grey

The Knightsbridge Sherpa is an 18W outdoor LED bulkhead with integrated emergency lighting, built around a die-cast aluminium body with a grey powder-coat finish and an opal polycarbonate diffuser. The LED gear tray offers three selectable colour temperatures — 3000K, 4000K and 6000K — set via a switch on installation, delivering 1680lm, 1790lm or 1810lm respectively. The emergency function provides maintained, non-maintained or switched emergency operation, producing 190-200lm in emergency mode for up to three hours during mains failure.

Designed for external wall and ceiling mounting in commercial, public and residential settings, the Sherpa suits car parks, walkways, building entrances, stairwells, communal areas and any location requiring IP65 protection against dust and water ingress. The 360mm diameter circular profile and 92mm projection from the wall give the fitting a low-profile presence suitable for mounting above doorways or under canopies without obstructing headroom. The emergency battery charges continuously during normal operation and activates automatically on mains failure, meeting Building Regulations for emergency escape lighting in certain applications.

The die-cast aluminium construction and impact-resistant polycarbonate diffuser give the bulkhead vandal-resistant properties, making it suitable for exposed public areas where fixtures may be subject to deliberate or accidental impact. The grey finish integrates cleanly with rendered walls, metal cladding and modern façade materials. The SMD LED array sits behind the opal diffuser, which provides a 110° beam angle and diffuses the light evenly across the lens surface without visible hotspots. The fitting is rated Class I and requires an earth connection during installation. The LED array is rated for 50,000 hours to L70B50, meaning at 50,000 hours of operation, 50% of the LED population will still deliver at least 70% of initial output.

Product Specification Sheet

Product Manual

How does the CCT selection work?

The LED gear tray has a switch that allows you to select one of three colour temperatures during installation: 3000K warm white (1680lm), 4000K neutral white (1790lm), or 6000K cool white (1810lm). Once selected, the colour temperature is fixed until the switch is manually changed.

What is the difference between maintained, non-maintained and switched emergency modes?

Maintained mode keeps the emergency LED on continuously, even during normal mains operation. Non-maintained mode only activates the emergency LED during mains failure. Switched mode allows the bulkhead to be controlled by a wall switch during normal operation but switches to emergency mode automatically on power loss. The mode is set during installation.

How long does the emergency function last during a power cut?

The emergency battery provides 190-200lm of output for up to three hours during mains failure. The battery charges continuously during normal operation and requires no user maintenance, though the 5-year warranty excludes the battery itself.

Is the bulkhead suitable for coastal environments?

The IP65 rating provides protection against water jets and dust ingress, making it suitable for most UK outdoor environments. However, in direct coastal exposure where salt spray is a factor, the grey powder-coat finish may deteriorate over time. For marine or heavy-salt environments, consider a marine-grade fitting with a higher corrosion resistance rating.