I think what really interests me about this is using it for sub lighting with LED. That way you get all the spectrum that the LEDs miss. Especially since car HID kits can be had for super cheap.
How many weeks into flower are you?
Awesome write up! I am really excited to see how these turn out. If you wanted to save some money on the power bill and the purchase of the PSU, just find a 12v power supply, if you run 50w HID kits then you need around 5 amps...