You get a lot more bang for your buck and output using Vero29 gen 7 COBs, they run $25/each. Get the B version, 50.7V--3 of them on a Meanwell 320W driver (HLG-320H-C2100B) and 3 fin pin heat sinks. It will run your right about $1/watt--a little more once you add in connectors, power cord...