Luminaire Dirt Depreciation (LDD) - The multiplier to be used in illuminance calculations to relate the initial illuminance provided by clean, new luminaires to the reduced illuminance that they will provide due to dirt collection on the luminaires at the time at which it is anticipated that cleaning procedures will be instituted.
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Sitelighting.com
Architectural Outdoor Lighting Solutions featuring Gardco and Emco Luminaires and Poles