Re: Lifetime of High Intensity LEDs

On Fri, 12 Jan 2007 23:36:06 -0500, Spehro Pefhany wrote:



They seem to have switched the railway level crossing lights to LEDs
around here. Of course the duty cycle is much lower for that application.

Ouch---one failure mode of LED traffic signals is that they don't generate
any heat, so they get snow-logged easily. In a snowstorm, the
snow deposits everywhere, even onto vertical surfaces such
as the signal lenses---incandescents tend to melt off the snow off,
but LEDs don't.
.