Sorry for the late response , i also changed some plans.
For now i have this heatsinks : 6 CM x 10 CM x 1 CM height, with an baseplate of 2 MM thick.
What i want to do use 9 heatsinks from above size and place a Cree CXA2530 on each heatsink,
i use 2 chinese drivers, the one of 30 Watt i use...