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Ene 03 External lighting

Number of credits available	Minimum standards
1	No

Aim

To recognise and encourage the specification of energy efficient light fittings for external areas of the development.

Assessment criteria

The following is required to demonstrate compliance:

One credit

The building has been designed to operate without the need for external lighting (which includes on the building, signs and at entrances).

OR alternatively, where the building does have external lighting, one credit can be awarded as follows:

The average initial luminous efficacy of the external light fittings within the construction zone is not less than 60 luminaire lumens per circuit Watt.
All external light fittings are automatically controlled for prevention of operation during daylight hours and presence detection in areas of intermittent pedestrian traffic.

Checklists and tables

None.

Compliance notes

Ref	Terms	Description
Shell and core
CN1	Applicable assessment criteria	Both options: All criteria relevant to the building type and function apply. Refer to Appendix D – BREEAM UK New Construction and Shell and Core Project Assessments for a more detailed description of the above shell and core assessment options.
Simple buildings
CN2	Applicable assessment criteria	All criteria relevant to the building type and function apply.
General
CN3	Single building assessments on larger developments or campuses and extensions to existing buildings	Where the building being assessed forms part of a larger development (or is an extension to an existing building) containing common areas and other buildings, the scope of the external lighting criteria apply only to external new and existing lighting within the construction zone of the assessed building.
CN3.1	Temporary lighting, decorative lighting and floodlighting	Temporary lighting such as theatrical, stage or local display installations, where specified, can be excluded from assessment under this issue. Decorative lighting and floodlighting must however not be exempt from the assessment criteria.
Building type specific
CN4	Prisons and other secured buildings security lighting	The criteria are concerned only with general external lighting, e.g. way-finding, car parking, decorative, signage, landscape, storage areas etc. Lighting specified for specific security purposes within secured buildings, such as prisons, can be excluded from assessment under this issue.

Methodology

Average initial luminous efficacy of the external light fittings

The individual luminous fluxes of all luminaires within the construction zone are summed (in lumens), then divided by the total circuit Watts for all the luminaires.

For lamps other than LED lamps, the luminous flux of a luminaire using those lamps can be determined by multiplying the sum of the luminous fluxes produced by all the lamps in the luminaire by the light output ratio of the luminaire (as confirmed by the luminaire manufacturer).

Note: LED lamps are typically integral to the luminaire (LED luminaires). As such, the manufacturers' literature will encompass both lamp and luminaire as a whole.

Evidence

Criteria	Interim design stage	Interim post construction stage
All	One or more of the appropriate evidence types listed in The BREEAM evidential requirements section can be used to demonstrate compliance with these criteria.

Additional information

Relevant definitions

Automatic control: An automatic external lighting control system that prevents operation during daylight hours through either a time switch or a daylight sensor (a manually switched lighting circuit with daylight sensor or time switch override is also acceptable) in addition to providing presence detection in areas of intermittent traffic.
Note: for external lighting not fitted with presence detectors, time switches must provide automatic switch off of lighting after a specified curfew hour, except in cases where there is a specific requirement for lighting to be left on all night.
Construction zone: For the purpose of this issue the construction zone is defined as the site which is being developed for the BREEAM-assessed building and its external site areas, i.e. the scope of the new works.
Daylight sensor: A type of sensor that detects daylight and switches lighting on at dusk and off at dawn.
Luminous efficacy in luminaire lumens per circuit Watt: The ratio between the luminous flux produced by an entire luminaire (light fitting) (in lumens) and the total power consumed by the lamps and the control gear contained within the luminaire (Watts).
Presence detector: A sensor that can turn lighting on when a presence is detected in the scanned area, and off after a pre-set time when no presence is detected. Presence detectors must be compatible with the lamp type used as very frequent switching can reduce the life of some lamp types.
Time switch: A switch with an inbuilt clock which will allow lighting to be switched on and off at programmed times.

Other information

None.