I take it the valves on your spray assembly are for shutting water off to your drip extension, which appears to screw on and off under that threaded pvc cap?
Just a freindly suggestion. At this age the lights actually need very little light intensity. Wait until they are at least 2 or 3 weeks before you move the lights that close. Honestly at this stage 2 23w cfl's or a single flo would easily handle your 4 girls.
Keep up the good work.
Cheers