light loss factor

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light loss factor

A factor used in calculating the illumination provided by a lighting system after a given period of time and under given conditions; includes the effects of temperature, voltage, ballast variations, dirt on luminaire surfaces, dirt on the room surfaces, maintenance procedures, and atmospheric conditions. There are two categories: losses which can be recovered by replacing old lamps or cleaning surfaces, and nonrecoverable losses, such as those due to component deterioration or uncontrollable voltage drops.

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