Luminaire Dirt Depreciation Factor (LDD)
Definition: The multiplier used in luminance calculations to relate the initial luminance provided by clean, new luminaries to the reduced luminance that they will provide due to dirt collection on the luminaries at the time at which it is anticipated that cleaning p
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Luminaire Dirt Depreciation – STANDARD
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Designing Lighting Systems for Use in a Dirty Environment | Electrical Construction & Maintenance (EC&M) Magazine
Light Output Declines with Time – Madison Gas and Electric – Madison, Wisconsin
LED street lighting: the effect of maintenance factor on carbon footprint – EE Publishers