using JB-weld here to heat epoxy the 3 watt LEDs, its just a thin layer , because i can actually press the led into the mix.
but its working just about as good as the overpriced arctic silver stuff, but its on very thin, the other parts are aluminum, not copper.
Some of my thoughts on heatsyncs.
Copper is 2X better heat TRANSFER than aluminum
and the other stuff like silver, and the alloys that are designed for thermal transfer are not MUCH better, not worth it anyways.
when you look at a thermal transfer chart the big jump from steal, to aluminum, but to silver the jump is not so big.
so the most practical thermal metal is copper, not the overpriced ones.
then copper Transfers heat, well sometimes you want to get RID of the heat.
so good combinations of pulling it away then getting it OUT into the air, would be copper base, but aluminum fins. which make up some of the better cheap processor syncs, and the weight is considerably reduced.
i have some cheap taisols, that blew away my total copper syncs that weiged to darn much anyways.