Judging from the spacing of those internodes, I don't think it was the light being placed too close, lolCould be heat stress, try to raise the lights
r u flowering those babies yet? Thats usually when u can tell. they don look too droopy to me, My plants sometimes do that in light hours only(thats sometimes rootbound).okay. still no one has answered the other question. is it ready to tell if its a female yet?