im also looking to build an LED grow light. got a buddy of mine whos repairing my 120watt chinease (1w). and i decided to order some more intense diodes to build a new array as the 1w's are okay at best. these 5w reds seem much more promiseing, i was going to have 5 watt reds and 3w blues but due to the 3w being on back order i may just order a bunch of the same 1w blues im useing to replace the chinease with.

im not sure what the driver is for, anybody care to explain?