Transcription of Calculating Light Loss Factors
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Calculating Light Loss Factors
SOLID-STATE STREET LIGHTINGCALCULATING Light LOSS FACTORSCONTACT INFORMATION:Dana BeckwithSenior Transportation Engineer1400 SW 5thAvenuePortland, Oregon 97201 Phone: Why Use Light Loss Factors Standards Lamp Life Light Loss Factors Equipment Factors Maintenance Factors Luminaire Dirt Depreciation (LDD) Lamp Lumen Depreciation (LLD) L70 LALWHY WE USE Light LOSS Factors (LLF) Luminaires age over time resulting in reduced lumen output Recognized standards identify minimum Light level requirements to be maintained on roadways and areas for life of lighting system.
Incandescent and fluorescent lamps are rated the same. LED Sources L. p = time in hours to which the lumen output has degraded to a percent “p” of initial lumens L. 70. commonly used Use LM-80 report to help determine L. p. Note: LED lamps do not typically catastrophically fail. There lumen output degrades over time. This can be maintained
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