I've interrupted light cycle many times and I've not had herms from it. I have had herms from unstable plants who rodelized to easily even in a stable light, climate and nutrient environment. But that's anecdotal. Plant hormonal shifts take a pattern and time to happen. These plants evolved in unstable nature where they had cloud cover etc...It would be ideal for me if I didn't have to go into a dark basement with no power. They're only nine days into flower, is all this stuff about not interrupting light cycle during flower a myth.
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Our power is really stable here. I don't think it has gone out for more than a couple hours in the past five years. Even during the big ice storm a few years ago when everyone lost power, we were toasty warm and well lit.
Anyway get the lanterns the plants will think it's a cloudy day and I don't want you falling down in your basement. I'd miss you around here.