well its not 3000w yet but yeah it will be about 60 to 65 cobs when its done depending how i drive the last few bars.costs for cree cobs and meanwell drivers with the round heatsinks runs about 1.50 to 1.60 per watt again depending how you drive them. i spend about 1500.00 on new lamps 2 x a year so theres one thing i wont be doing anymore lol.but you can build cheaper using cheaper cobs and driving harder your cost per watt will go down.i built most of these bars @ 1050 ma for efficiency,and i have a few bars running 1400ma and one set up @ 75w per cob.