[AT] photo finish

[Steve W.]

Dick Day wrote:
> John, you got me wondering how hot LED's do get. Here is an article that I 
> found...
> 
> "Anyone who has ever grabbed hold of a light bulb while it was still hot 
> will probably ask, "Do LED lights get hot?" Actually, LED Lights do not get 
> hot in the sense of creating heat that will burn a person or melt a surface. 
> In fact, an LED bulb that has been on for days can be unscrewed with bare 
> hands! A very small immeasurable amount of heat is generated during the 
> process of the current flowing to the semiconductor, but this heat is so 
> miniscule it can barely be detected. This is one of the greatest advantages 
> of LED lighting for a number of reasons."
> 
> --------------------------------------------------

While the smaller LEDs don't create heat like other bulbs the high 
output units generate a LOT of heat right at the actual junction where 
the light is generated. The heat sinks are there to dissipate that heat.

http://en.wikipedia.org/wiki/Thermal_management_of_high-power_LEDs


-- 
Steve W.