new grower please look at my setup!

thanx guys i have lowered my lights buy about 12 inches keeping my eye on temp today
another thing is when do i change to 12 on 12 off?

also just looked at air cooled hoods would i not be better with this http://www.google.co.uk/products/catalog?hl=en&newwindow=1&safe=off&rlz=1C1CHFX_enGB503GB503&biw=1366&bih=667&q=air+cooling&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.&bpcl=37189454&ion=1&um=1&ie=UTF-8&cid=1357016771369521334&sa=X&ei=d5yXUOG4BaeM0AXcyIGoCA&ved=0CJcBEPMCMAM
its a cooler and humidifier?
and its around the same price? thanx guys for help btw!