Hermie plants?

Will a fluctuating light cycle during vegging cause your plants to go hermie? I've just got 6 seedlings right now and I usually run my lights 18 on 6 off. The 6 hours off is from noon until 6pm. Is it ok to put the seedlings in the window one or two times a week during the dark cycle? I have my grow in my attic and the temps stay around 75-80 max at night, but around 11 am they get close to 100 up there, and still remain in the 90's with lights off so I like to bring them down during that time. In a few weeks the temp will drop and it'll be perfect up there, and it's a lot easier to get heat up there VS cool air.
 
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