General Terms

Lumen Output: (lm)The SI unit of luminous flux.
A quantity of light emitted by a source i.e.: a lampLumens per Watt: (lm/w)How many lumens are produced for one watt of power. The ratio of light emitted by a lamp to the power consumed by the lampIlluminance: E Unit: (lux)The luminous flux at a point on a surface.
The physical measure of brightnessCRI: Color Rendering IndexThe effect of a light source on the color appearance of objectsCCT: Correlated Color TempColor temperature is a simplified way to characterize the spectral properties of a light source. SI unit for color temperature is Kelvin (K).Lux: (lx)The unit of illuminance, equal to one lumen per square metreWP:Working Plane: The surface or level on which light is measuredMaintenance Factor:The method of calculating light loss after installationRSMF:Room Surface Maintenance Factor Calculates the loss of light from reflective surfaces such as floors and wallsLMF:Luminance Maintenance Factor Considers the loss of light from a luminaire after a given usage due to dirt dispositionLLMF:Lamp Lumen Maintenance Factor The proportion of the initial light output of a lamp produced after a given time

Emergency Lighting

Non Maintained:A luminaire incorporating one or more lamps which function from the emergency supply only upon a full mains failureMaintained:A luminaire incorporating one or more lamps which function from both mains and emergency supplyCombined:A luminaire incorporating two or more lamps, one of which only functions from the emergency supply, the remainder from the mainsSustained:A luminaire containing two or more lamps, at least one of which is energized from the emergency supply and the remainder from the normal supplySelf-Test:A Self–Test luminaire carries out regular dependable automatic testing of the battery, charger and lamp(s), if any faults there is visual/wireless fault identification.