Emergency Lighting Glossary

Anti Panic Lighting	The part of the emergency escape lighting provided to avoid panic and provide illumination to allow people to reach a place where an escape route can be found.
Ballast Lumen Factor (BLF)	The ratio of the light output of the lamp when the ballast is operated at its design voltage compared with the output of the same lamp operated with the appropriate ballast supplied at its rated voltage and frequency.
BS5266	The British Standard for emergency lighting, it has now been revised to conform with the European Standard EN1838. It is now issued in the UK under the reference BS EN 1838 / BS5266 Part 7.
BS EN60598-2-22:1999	This is British European luminaire product standard.
Central Battery System	A system where the batteries for a number of fittings are housed in one location, usually for all of the fittings in one sub-circuit.
Central Test	A testing systems for a wide range of applications operating on 24v, 50v or 110v as well as Static Invertor projects.
Combined Emergency Fitting (Sustained)	A light fitting containing two or more lamps at least one of which is energised from the emergency supply, the remaining lamps are supplied from the normal supply.
Conversion Kit	A product used to provide standard mains luminaries - including low voltage - with an emergency back up should the mains power fail
Emergency Exit	A way out intended to be used at any time. Final Exit is the terminal point of an escape route at which persons are no longer in danger from any hazard requiring evacuation of the building
Escape Route Lighting	Provided to ensure the means of escape can be effectively identified and used
Externally Illuminated Safety Sign	A sign that is illuminated when it is required by an external source.
'F' Mark	Shows the luminaire can be mounted on flammable surfaces
High Risk Area Lighting	The part of escape route lighting provided at a potentially dangerous location to enable proper shutdown procedures for the safety of the operator and other occupants of the building.
Housing 850^oC Test	All emergency luminaries on escape routes must pass this test. Self-extinguishing grades of plastic must be used.
ICEL 1001	Registration is the industry standard of approval for photometric claimed data and performance of emergency lighting equipment which is tested by the BSI>
ICEL 1004	THe industry standard and accepted practice for the conversion of mains luminaries to having an emergency battery powered back up.
Internally Illuminated Safety Sign	A sign that is illuminated, when it is required by an internal source
K Factor	The ratio between the light output from the lamp in the worst condition, normally at end of discharge and with cable volt drop, to the light output at nominal voltage.
Maintained Emergency Lighting	A light fitting containing one or more lamps all of which operate from both he normal and emergency supply at all times.
Mounting Height	The vertical distance between the light fitting and the floor
Non-maintained Emergency Lighting	A light fitting containing one or more lamps all of which operate from the emergency supply only following the failure of the mains supply.
Normal Lighting	All permanently installed artificial lighting operating from the mains supply for use when inadequate lighting is available during occupation of the building.
Rated Duration	The manufacturer's declared duration for a battery operated emergency light. Typically one to three hours when fully charged.
Rated Load	The maximum load which may be connected to the system which will be supplied for the rated duration.
Re-Charge Period	The time taken for the batteries to regain sufficient capacity to achieve their rated duration
Safety Sign	A sign which gives a general safety message, obtained by a combination of colour and geometric shape and which by the addition of a graphic symbol or text, gives a particular safety message (ISO 3864: 1984 )
Self Contained Emergency Light Fitting	A fitting or sign providing maintained, non-maintained or combined emergency lighting in which all of the operating components are within 1 meter of the housing.
Self Test	A testing system for a wide range of self contained luminaries
Slave Fitting	An emergency light fitting without it's own batteries that is design to work within a central battery system
Standby Lighting	That part of emergency lighting provided to enable normal activities to continue substantially unchanged (IEC 50 Chapter 845)
Static Invertor	A central systems which enables mains luminaries to be utilised as emergency fittings without the need for additional wiring.
Sustained Emergency Lighting	See combined emergency lighting
Uniformity Ratio	The ratio between maximum to minimum illuminance measured at the working plane.
Utilisation Factor At Zero Reflectance (U.F.O.)	Determines the proportion of light output from a lamp that falls directly on the floor for different room indexes and types of diffuser.
Uninterruptible Power Supply (UPS)	A versatile method of providing back up power and or steady, constant mains supply to specific applications such as I.T. and telephones as well as being used to provide an emergency lighting facility in certain installations.