I'm doing a very similar setup. I found a very cheap constant current driver 75v @ 680nm. I plan on reflowing my own tristar chips w/ Epistar 460nm and 625nm. I know 625nm is not ideal but the price was right. How do you plan on mounting the tristar? My plan is dap of thermal paste with a tap/dye.

Weezer do you have a link for the comparison between 660nm and 627nm?