hey bro, didnt really understand the beginning part of ur post? if ur flower room is tight it shouldnt matter the other ones leaks provided a dark room? but with your question i read on another forum that u gotta leave her in the dark for 24hours before u make the change, in ur case 37, if ur early on in flower it will probably just mess with her hormones a bit but after a few days should be fine, at the end of the day she is a weed and if everything else is spot on, should work out
hopefully someone will follow up with the science behind it, good luck