Found your thread through bing. I like your setup. I may have missed it, but how did you wire those fixtures if you don't mind me asking? I'm Thinking of slowly phasing out my hids, and this is right up my alley lol
I simply wired them all up in parallel, hot to hot, neutral to neutral. In other words, select 2 colors of short wire (I cut up a broken outdoor electrical cord) and wire up all the same colored screws or terminals from one socket to the other with the same colored wire, do the same with the other. Then I terminate the last (or first however you want to look at it) with a length of cut electrical cord that has the plug on it. I used a heavier gauge outdoor electrical cord as my wiring material for extra safety.
One thing you can do instead is simply buy a few 8-light bath bars and attach a cord with plug onto them. I scored 6 of them from Wayfair.ca for $18 each on sale (tax and shipping in). They look too cheap to put in a real bathroom, but they have safe water resistant ceramic sockets and perfect for a grow space.