Join Date: Oct 2011
Location: currently NYC area, previously, Bay Area
Bikes: 1974 Raleigh Grand Prix
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The lifespan of some LEDS is MUCH less than an average human lifespan. (And of course, they both vary.)
Blue ones in particular will often lose most of their brightness after only a few years of being left on continuously. Using them at less than their rated current or pulsing them (using PWM) in some cases extends their lives or allows them to be run brighter for longer.
And of course, adequate heat sinking is important on power LEDs.
Consult the LED manufacturers data sheet. And bear in mind that for some of the figures, we really don't know.
However, its safe to say that LEDs will last longer in many applications than anything else that is affordable to most people.
But in applications where the lights need to work for thousands of years, (and there are some!) they use different lighting methods.
Last edited by christ0ph; 01-09-12 at 09:44 AM.