idk, i get into this one a lot when i always read people saying that light leaks cause hermies, and i point them to outdoors and the moon light like the op is talking about..
obviously, large amounts of light during lights out are going to have a huge affect on flowering.. someone mentioned street lights and half a plant flowering and half not because of street lights.. but i have yet to encounter a hermie with smaller amounts of light in flower..
i grow in a small closet set up and i tend to leave the door open all of the time to keep temps down.. i usually run the lights at night to keep the temps down, so that means for me lights out are during the day hours.. i'm not saying i get huge amounts of light in my grow, but it sure as shit isn't pitch black either, that's for sure..
i have heard people saying that the small led on some grow equipment is enough to make a plant hermie, and i say bs, as my power chord is lite and i've been using the same one for about 4 years or so now, and not one hermie has been seen.. i grow anything from regular seeds to fem's as well..
i'd love to know exactly how much light is required to create problems, but ime, smaller amounts of light will not hurt nor interrupt flowering ime..