My 50/50s were dulling out yesterday so i went got new ones now they wont turn on, i dont think its the ballast because i checked to see if power was gettin to the bulbs and the meter said it was getting voltage ...any idea if the ballast could be shot or anyother parts i should check... its a coralife 36" mh/pc combo.... Ne help would be cool so i dont have to go buy a new light .... thanks