Whats the Most Reliable Way to Make Feminized Seeds?

Gonna be ordering a nice selection of high-end seeds soon, ranging from Pineapple Express to G-13xColumbian Gold. I only have enough space to grow from seed each time, so cloning is not an option for me. So, I would like to do an entire grow with them, only for the purpose of producing 100's of Feminized seeds, so that I can keep the strain going without having to order more seeds again.

I did a outdoor grow a few years ago with a couple Afgan Kush + Super Skunk plants, which ended up getting light polluted by a nearby street light, in turn turning them herm. I let them finish, and they produced 100's of really good healthy looking seeds. I kept them, and didn't think much of it until a couple years later when I read that females that are stress induced somehow into becoming herms, usually produce feminized seeds.

After I started growing Indoors, I decided to give the ol' AK+SS seeds a go, and out of the 30 I have grown to maturity so far, 27 of them have been straight female all the way through the grow, not one herm. I know I'm not that lucky, so the seeds had to have been feminized.

My question is: What is the most reliable and foolproof way to make a Female turn Herm, and produce feminized seeds? The light pollution way seemed to work well last time, but I wanna see if there are any better ways of doing it out there.

Thanks fellow RIU'ers and a happy toking sunday to you all.

not my area of expertise but i know one way is to simply flower the plant wayyy to long.
cannabis like everyother thing on earth lives to propagate. once it realizes that it is not getting pollenated after a long time it will take matters into its own hands
and go hermi.
you can do this with a combination of stressing the plant deep into flowering.
clones are mch better tho i hope you consider them instead of wasting a female plant that could be budded

I have very little room to work with here, I'm in an apartment and have only a small closet, no room for clones. So, I grow from seed each time. Which is why I need to do an all seed grow with herms, so I can have a nice fat seed stash to work with. I also want to hook up some of my friends with some killer genetics (for free I might add), as most of them only have crap mexican bagseed to grow outside each year, and are too paranoid to order seeds themselves.

No one has an opinion on any better ways to make feminized seeds?

Ive heard of a spray called StamenIt! which stresses the plant to think its dying,making it turn into a male with female genetics. Mate this baby with a normalfemale and vwahlah,fem seeds.

There's a lecture on High Times.com by Soma I believe from the Cannabis cup, he talks about a way to do it along with some other advanced growing techniques.