Every thing is good except 2 things.
1. The dripper. I think you only drip for like a half hour a day. That way the rock wool doesn't stay totally soaked all the time. You should soak it once a day, more if your plants dry it out faster.It should be almost dry before you water. With your light I'm sure it dries out hella fast.

2. Your light is a 75 watt reptile light. That light is designed to produce heat for a reptile. It is not designed to make light. It is using a lot of juice and producing almost no light. You need to put the biggest wattage cfl you can get your hands on in there. Better yet have like 4-6 of em'. That reptile light is NO good at all, also it is going to make a lot a lot a lot of heat for no good reason. Get that hps, till then get a/some cfl(s).

http://boards.cannabis.com/indoor-li...uch-light.html

Otherwise its a very innovative grow. How did you convert 110 volts ac to 12 volts dc?