Ok, let's hear it!

[mrhasan]

Originally Posted by sphelps

Ahhh..... wrong

LEDs produce a large amount of heat per area which can seem high because of there size but overall is very little. The junction temperature (between LED and heat sink) needs to be kept relatively cool to insure the LEDs don't overheat, in order to do this the heat sink has to be large enough and kept cool enough to maintain allowable LED temperatures. The cooler the heatsink the better the LEDs work and the longer they last. Most heat sinks probably run around 25°C.

Is the number that low? I remember burning myself by touching the heatsink of a DC PSU. I am sure the heat sink doesn't run boiling hot but still 25 is much more lower than what I thought (my guess was around 50-60 )