Light-emitting diodes (LEDs) have been used as indicator lights and displays for many years. However, because of their low levels of light output and the lack of color options, LEDs were limited to these few applications.
In any lighting system, lamps and auxiliary electrical devices fail and must be replaced. Dirt and dust accumulates on fixture surfaces and should be cleaned. System problems must be corrected, and lighting controls should be adjusted as space conditions change.





