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The round pin fin heatsinks are typically outfitted to work passively, thus eliminating the need for fans. Those offering help in this thread will guide you in the right direction regarding the particulars. They know what they are doing.

Learn a few of the fundamentals. Understand how DC works (vs AC from the wall). Watts = volts x amps Understand forward voltage of your chips and how that relates to the parameters of your driver. Learn what it means to wire your chips in series (it's easier to understand, imo, vs. parallel...