i have 1 of those 4ft flourisent light bulb that use with the ballast every once in a while when i turn on the light one of the 2 bulb came on ok the other 1 came on but real dull and flickering like it want to get bright like the other i change both light bulb now both of them does the same thing they come on real pale then it might take aboyt 30 minutes to get bright they are about 1 year old so i dont think it's the ballast is it possible it can be cause by a low voltage or amprage not enough to for the ballast or light