imo, people get all freaked out over hearing that a grow must be entirely pitch black for flowering or you'll have a room full of hermie plants..
ime, this is so far from the truth it's not even funny.. i've been growing in a small closet for about 5 years now, and often times i leave the door open to keep temps in check.. my grow is so far from light proof it's not even funny to say the least.. i've grown all sorts of beans from regular to feminized, and not once have i seen a hermie plant in my grow.. never..
i think breeders like to say things have to be pitch black in an effort to take blame away from their hermie genetics and put the blame on inexperienced growers who believe anything breeders say..
again, just my $.02 and experience.. take it for what you will..