For those of you who have constructed LED lighting using the Cree Q5's....how have you gone about heatsinking the stars? For example, what have you attached the stars to (e.g. aluminum bars) and how have you actually attached them? I see available 1)arctic silver thermal compound, 2)arctic silver premium thermal adhesive, 3) arctic alumina premium thermal adhesive, and thermal tape. If you use one of the adhesives or tape instead of the compound, is that a strong enough connection or do you also have to use screws to hold the stars to the heatsink?