2 default and 1 FIMming

Hi, I`m planning to grow 3 white widows, 2 of them just as normal plants and one of them - with FIMming method so that all m2 is grown with plant..
And all those 3 plants in one place..would it be a good idea?
I want to use 250 MH/HPS.. How much G`s I could have (dried) ..and where could I find the REAL white widow seeds (feminised).. and not too expensive..
What else should I know?

Keep the plants together. You should get about 5 lbs dry, unless your plants grow to normal size then you might get 3 oz MAX. Hope for a male and breed seeds.