Well, HPS creates a lot more heat (due to efficiency) than CFL's which is something you have to consider. From what I can tell the HPS cost is almost the same, if not lesss than CFL's. This is just because the HPS creates more lumens per watt, and you'll need at least 7X43w CFL's to compare to a 250w HPS. Even then it's still a lesser amount of lumens. |