I'm looking to produce a small run (5-10) of high-power RGB LED lamps, and am curious about what kind heatsinks I can get away with. These LEDs are 3W RGB LEDs (1W per channel), as seen here: http://cgi.ebay.com/3W-High-Power-RGB-Led-6-Pins-10-pcs-/380342493606?pt=LH_DefaultDomain_0&hash=item588e2de1a6#ht_1893wt_1086
These lamps could potentially be run for many hours at a time, so the LEDs need to be properly cooled. Can I simple flat pieces of aluminum, or should I spring for some professional heatsinks? If aluminum, approximately what thickness and size should I make?
Here is a heatsink I've found on eBay, but its international, so it'd take a while to ship and is a bit of a gamble: http://cgi.ebay.com/5-x-3W-Aluminium-Heatsink-High-Power-LED-Bulb-/170613491066?pt=LH_DefaultDomain_0&hash=item27b95b457a#ht_632wt_698
If I can make my own that'd be great, just curious about other people's experiences.