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Emergency Lighting Glossary

GLS General Lighting Service - Simple Tungsten Lamps
PAR Lamp Parabolic Aluminised Reflector Lamps - Tungsten Lamps in a heavy duty spot form
CFL Compact Fluorescent Lamp Miniature - Compact fluorescent lamps, 9 to 55w
Efficacy The ratio of light output, measured in lumens, to the amout of power used by the lamp to produce the light, including any power consumed by the control gear if used. Generally expressed in Lumens / Watts.
Light Output The amount of light measured in lumens that the lamp emits under normal conditions. Measured after 100 hours burning in case of dischage lighting.
Colour Appearance The visual appearance of the colour of the light given out by the lamp. Usually described as Warm or cool etc. Often given as colour temperature. arm would be in the region of 3000 Kelvin, cool in the region of 4000 Kelvin
Kelvin A temperature scale broadly similar to centigrade, but starting from absolute zero (-273 centigrade). Thus 1000 degrees C is equal to 1273 degrees Kelvin.
Service Period The average life in the case of tungsten lamps, or the number of hours after which discharge lamps should be changed as to give a resonable return of light for energy used.