I recently replaced my T5 lights with new bulbs but am not getting the same light output as before. Two bulbs I know for sure are the day time 6400K 54W. The other two are warm T5s, but they are not clearly marked and I think I tossed the receipt. I was wondering what other people use. I've heard mixed feelings of just using straight day time bulbs versus using a combination of these and warm ones. What are your thoughts?