Quote:
Originally Posted by MPaulHolmes
I think a metal enclosure would be much better thermally speaking than a Lexan box with a heat sink on top.
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Lexan is a very efficient thermal break so it will not transfer heat well at all. An aluminum panel mounted over the Lexan would not work even 25% as well as if it was the actual enclosure material. A very small Lexan window would be the most I would use it for in this application where you want maximum heat loss through the enclosure.
If you want heat dissipation then aluminum is the way to go. The more surface area the better. A finned extrusion would give you the best bang for the buck.
Direct contact with a thermal grease will offer the best heat dissipation.