L.E.D Questions

[chandigz]

I believe the 3 year(30000 hr life, generic and cheap or lower end leds) or 5 year(50000 hr life, Cree leds and other high end leds) rating is based on the fact that at that point they will only be producing 70% of the original output not because of colour shift. Led's don't use phosphores and therefore should not go thru a colour shift like halides/flouescents. Replacement times depend on the quality of leds,heatsinks used, hours per day, types of drivers( constant/variable current drivers, or voltaged regulated drivers on low end and cheap chinese units), and how high they are driven. The higher quality units usually have replaceable or customizable leds/led panels.