Quote Originally Posted by texas grass
if it didnt turn back on i would try and get a new bulb first. its not goin to hurt your plants having a different light for a day.

having light problems i would not change the time on the lights. keep em the same. it will hurt the plants more if you change starting times by .5-1hr(doing it multiple times)

good luck
What he ^^^ said.

Also, check your bulb... there are bulbs that are designed to be hung vertical. And if you hang them horizontally, they will self-damage themselves.