CA452001EN - March 2015
Glossary of Terms
Area within which a specific activity is carried out.
Anti-Panic (Open) Area Lighting
The part of Emergency Escape Lighting provided to avoid panic and
provide illumination allowing people to reach a place where an escape
route can be identified.
Area adjacent to the immediate surrounding area.
British Approvals for Fire Equipment. Single registration scheme for
each product or service within the fire protection industry. SP203-4
is a modular scheme for the design installation commissioning and
maintenance of emergency lighting systems.
The component that controls the operation of a lamp from a specified
low or high voltage AC or DC source (Typically between 12 and 240
Ballast Lumen Factor
The ratio of the light output of the lamp in emergency operation
compared with the light output of the same lamp operated by a
reference ballast at its rated voltage and frequency.
Secondary cells providing the source of power during mains failure.
Battery - Recombination
A battery that is designed to recombine the electrolyte, constructed so
that no provision is made for replacement of electrolyte (sometimes
Battery - Vented
A battery that requires replacement of electrolyte at regular intervals.
The discharge capability of a battery, being a product of average current
and time, expressed as Ampere-hours (Ah) over a stated duration.
Note: At fast rates of discharge the full ampere hour capacity of the
battery is not available.
The unit of luminous intensity.
Central Battery System
A system in which the batteries for a number of emergency luminaires
are housed in one location. Usually for all the emergency luminaires on
one lighting sub-circuit, but sometimes for all emergency luminaires in
a complete building.
Colour Rendering Index (CRI)
A measure of the degree to which the appearance of a surface colour
under a given light source compares to the same surface under a CIE
reference source. The index has a maximum value of 100.
Colour Temperature (CCT)
All materials emit light when heated (eg, metal glows red through
to white as the temperature increases). The temperature to which
a full radiator (or ‘black body’) would be heated to achieve the same
chromaticity (colour quality) of the light source being considered, defines
the correlated colour temperature of the lamp, quoted in degrees Kelvin.
Combined Emergency Luminaire
A luminaire containing two or more lamps, at least one of which is
energised from the emergency supply and the remainder from the
normal supply (If the emergency lamp is only illuminated in a mains
failure condition this luminaire is regarded for fire authority approval as
The voltage declared by the manufacturer to which all the ballast
characteristics are related.
Glare produced directly or by reflection, that obscures or impairs vision
of an object, but does not necessarily cause any discomfort.
Glare which causes visual discomfort.
Downward Light Output Ratio (DLOR)
The ratio of luminaire light output below the horizontal, compared with
total lamp light output.
The lighting provided for use when the supply to the normal mains
lighting installation fails.
Escape Route Lighting
Lighting provided to ensure that the means of escape can be effectively
identified and safely used when a location is occupied.
The way out of a building, which is intended to be used at any time
whilst the premises are occupied.
The terminal point of an escape route, beyond which point persons are
no longer in danger from fire or any other hazard requiring evacuation of
The discomfort or disability that occurs when there is an excessive
change of luminance in the field of vision.
High Risk Task Area Lighting
Emergency lighting provided to ensure the safety of people involved in
a potentially dangerous process or situation and to enable proper shut
down procedures for the safety of the operator and other occupants of
Housing 850°C Test
Mandatory test for emergency luminaires used on escape routes, to
establish that materials do not burn at given temperature.
Self-extinguishing grades of plastic must be used, or alternatively glass
ICEL 1001 Registration
The industry standard for the approval of photometric performance and
claimed data of emergency lighting equipment, which is tested by the
British Standards Institute.
Number classification of the degree of protection a luminaire provides
against mechanical impact.
Immediate Surrounding Area
Band surrounding the task area within the field of visual field.
Ingress Protection (IP) Number
Number Classification of the degree of protection a luminaire provides
against the entry of solid foreign bodies and moisture.
Diagram showing contours of equal illuminance.