Before you buy 2 400 watters, why not one 1000 watt HPS? You get basically a 400 watt light for 200 more watts and almost triple the lumens. 400 watt = 55K lumens, 1000 watt = 145K lumens. Lumens = big budz. By the way, nice efficent setup, Postman. I am going to construct two fo those for moms, and I had already thought of the PVC inner frame before Zandor mentioned here. Should you want to build one, here is the a link that has all the fittings you will need.
http://www.pvcplans.com/pvc-suppliers.htm

They got all kinds of kewl fittings for us to play with.



b0nger