First of all, thanks for reply!
You have opened a whole new world for me, lol
Now I have extra question:
I see that maximum power of one CXA3590 is 150W, does it mean that it's ok to use just one cob in the cabinet with this sizing: 40" Tall x 20" Wide x 16" Deep?
P.S. I have found a trusted suplier here in Kiev, Ukraine, which is selling both CXA3070 (3000k and 5000k) and CXA3590. They are running a sale right now, so it's possible to buy these COBs for really low price (about 30$ for 3070 and 45$ for 3590). Unfortunetly they don't have proper website and don't provide shipping, but if anyone here is interested in getting them, than i could help. It will be my payment for help i received here.