'stray' light is not as big a deal as some would have you believe ... according to a rather technical botany article, to affect marijuana, the plants would have to be subjected to light several times brighter than a full moon, and it would have to bathe the entire plant, stray light hitting just part of the plant will not affect changes ... this, according to a published study, and from my own experience ... a lot of the time, I leave my cabinet doors open, to keep temps down, I've never had any ill effects from it ... hope that helps ... as I've said many times before, regarding this question: " what ? .. your world doesn't have a moon and stars ? " ...