What is the importance of complete darkness during flowering?

Would anybody know to what extent COMPLETE darkness is necessary for flowering?

I have a way of providing this but the area gets relatively warm when i have the black vinyl over my grow area. I would have to drill some holes through the upper shelf and place about 2 or three pc fans which I probably will do anyway.

The only light that could reach the area is about 10 feet away from behind the bathroom door (not direct from bulbs) 2 incandescents, is that a serious issue?

I have a curtain blocking off the entire area but there is about 4 feet above it that is oncovered which I can also easily solve (still in veg now seems to be fine).

Thanks for your help.

It is 100% necessary. Your plant will be a hermie or a male if there a leak. The least bit of light is enough to tell the plant's to wake up, and you definately don't want to interupt it's photoperiod.

It's not so important for the veg cycle?

Yeah It is if your doing 18/6 but if your doing 24/0 then you won't have any darkness.
Complete darkness means !COMPLETE DARKNESS!

Even a feminized seed?

Yes my friend

i may have to disagree to some extent on that one, i have my ladies in the basement and the door on my grow box is about two inches short of being flush(making a good seal) so whenever i HAVE to turn the light on in the daytime they get disrupted a bit i guess...i havent seen any problems because of it but then again maybe they would have grown better if i never did it.

I agree with the Basement man. In the veg cycle its not near as important. But you will definitely get hermies in the flower cycle. The only positive is, if you are growing from clones your seeds will be female. Happend the first time I had a light leak. So I did it again and both times the seeds that grew were all female. I wonder if thats how seed companys do it?