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
texas grass Reviewed by texas grass on . HPS won't ignite As the title says it appears my HPS bulb won't ignite. All I see is a blue light with what looks to be something arcing in the arc tube. One end is orange and the other end is not lit, in the middle is the blue light that appears to be arcing in there. I've swapped it out in the mean time for my MH conversion bulb. My plants missed out on about an h our of light. I've set the timer back an hour to compensate for the time missed. Do you think this is going to freak my plants out. I'm Rating: 5