if you plant outside too early, and the light cycle goes from long days, to shorter days, to long days again, i'd be concerned about re-vegging ...not that revegging is necessarily bad in and of itself, but I think it stresses the plant and stunts growth/increases chance of the plant herming
I've started mine indoors under fluoros, lights on 24/7 ...i want to put em outdoors in late may after threat of night frost passes...the light cycle outside will be about 15/9 then...and the longest day of the year here (june 22nd) we recieve 15.27 hours of light (only a half hour difference...insignificant IMO)
so i plan on slowly cutting back some hours, maybe 1.7 hours/week over the next 5 weeks till they're ready to go outside
hell, i have plenty of bagseeds....and the plants i've started i small, so i have plenty of time....i could just re-start all over again and actually USE my light timer, set at 15/9 but idk if it really matters that much