Hermaphrodite stress

Light leaking IS stress. But yes, stress induced weeks prior (since that stress isn't a single event, it has gradual, systemic effects coz it's conditional, environmental, nutrition, etc) can make plants hermi later than when the stress was induced (and the hormonal balance gradually shifts).

Its a genetic problem in theory but light leaks will not help or disturbing their night cycle that's why I fill the grow room with green light so if any light were to get in it cant stress your ladies :) though even that is not enough sometimes i had 15 plants show bananas recently it was heart breaking but I know it was down to genetics because any light getting in would of been green and not effected them in anyway so its near enough impossible but to be sure I always try and test my tent between grows by sitting in to and looking for any light I can see protuding in if i can see any I will block it with tape or block it with somekind of stuffing. thats the best you can do though growing strains that you know dont herm is a good start so basically just strains you have grew before that had a good harvest and didnt herm lol