First of all, I would not stress it. Some strains are slightly more susepitable (sp?) to changing light than others, but it would have been a continuious light, not an interruption, which would have been worse. I.E., it you turned a light on during the middle of the night cycle. But in addition, i have some more opinions that some of you might agrue with, but you should think about some of this... but first, dont think i think it's fine either to interrupt your cycle regurarly.
I have seen outdoor grows within feet of major roads. with headlights constantly on the plants. Next, haven't any of you ever lost power, or had a circuit trip? Didn't this ever happen to anyone else? How often does it really cause hermaphrodites? I can't ever remember this happening because of an isolated incident. What interrupting the light cycle does do is create stress. Stress reduces yields and too much stress will cause hermaphrodites.
So, no, as long as your interruption was an isolated incident, i dont think you have anything to worry about. Just try to watch any other stress for a bit.