I had (what I think to be) a great idea for a LED array heat sink and thought I would take the time to share it with the class.
I thought I would Epoxy Pennies to the back of the circuit board and then drill holes through the spots that the LEDs would stick through and then solder them on the back. The old Pennies are made of pure copper and should prove no problem to solder to and should (theoretically) act as a very good heat sink. If the pennies should touch in any undesirable place, simply take the trusty Dremel tool to them and cut them up. I don't know how I ever got by without a Dremel tool. Very handy! About the only metal that will conduct heat better than copper is Silver or Gold, and that's not gonna happen. LOL. The way I figure it, the whole heat sink should only cost between $.05 and $.10. A hard price to beat.
How about it? Anyone else kicking around any ideas for heatsinking your LED array? I thought it would be nice to have a thread devoted to heat sinking just to see what new ideas could be garnered on the subject.