Color shift may occur well before any failure point associated with lamp lumen depreciation
Given that LED lamp life and lumen maintenance are inseparable, what lamp lumen depreciation
(LLD) factor should be employed for LED lighting systems?
Maintained values are determined by applying multiplying factors that model the effects of lamp lumen depreciation
and dirt depreciation to the initial values.
Participants will also learn how to avoid making poor lighting decisions by understanding the factors that go into lighting design calculations, including lumen maintenance, lamp lumen depreciation
, luminaire dirt depreciation, ambient temperature effects and the pro-ration of IES files, to name a few.
Recoverable LLFs include lamp lumen depreciation, luminaire dirt depreciation, and lamp burnout.
Lamp lumen depreciation (LLD) was expected to be a major contributor to total light loss.
9-20], yet in practice lighting design professionals rarely use a lamp lumen depreciation value corresponding to 70 percent of lamp life.
The recent work of Lemons [Lemons 2008] suggests that there may be both an initial tilt factor and a lifetime tilt factor, which is based on the idea that lamp lumen depreciation may be dependent upon lamp orientation.
If the illuminance is right when the facility is upgraded or relighted, it will be wrong as lamp lumen depreciation
and the dirt factor start to kick in," Fetters says.
Recoverable light losses included Lamp Burnout Depreciation, Room Surface Dirt Depreciation, Lamp Lumen Depreciation
and Luminaire Dirt Depreciation (LDD).
One is lamp lumen depreciation
, the steady lessening of light output from a lamp over time, while energy consumption remains constant.
Deco induction luminaires feature instant-on, no restrike, cold weather performance down to-40 deg C/F, electrode-less lamps for vibration resistance, superior lamp lumen depreciation
with 80 percent lumens at 60,000 hours, 90 CRI color and a 10-year warranty.