So light poisoning was a tek thats been abandoned AFAIK. I remember reading about it in the early 2000’s. The problem was that it works on genetically herm females, and produced a high proportion of hermie feminized seeds. Thats why femmed seeds have such a bad rap, when they first were making them they sucked. Its why I still don’t trust them 100%; because of unscrupulous people who just wanted to make money from selling shit seeds, then blamed hermies on the grower.
Now if you want to put multiple generations in, and repeatedly search for hermies to try and clean up your line, then by all means use this technique. When the light poisoning tek doesn’t work, you finally made a solid female. If you want to take a truly solid female without any intersex traits and make seeds, your going to need STS.