can i do 4 Automatic AK47 under the 250 watt hps

You should be able to do 4 no problem. Like I said in my earlier post, my setup is 31.5x31.5x63 with a 250 hps and I have 9-9inchx9inch square plastic pots of LR2s going. And for anyone wondering about the auto strains....I've been growing LR2's for over a year now and I love them. I like the short stature, the time they take, the fact that you don't have to change your light cycle so you can introduce youngs plants in with older ones, and I like that they take 3 weeks at most to show sex. I am by no means an expert on auto's, but if I can answer any questions for anyone I'll try.

Oh yeah....and that's a good guess for yield. Obviously depending on the conditions though.

if i let one Auto-AK47 seed will those seeds be auto two yes/no i don't want to pay for seeds any more

Yeah...if you pollinte it. I usually pollinate a whole branch with a small paint brush that I dip into pollen that I've collected and then "paint it" onto the pistils. Just remember that you usually will have to let the seeded branch go longer than the rest of the plant so the seeds have enough time to mature. You can sometimes see them split the calyx open. Once you harvest the seeded branch, it's a good idea to let them sit in a dry location (for at least a couple weeks before geminating them) so that they can become healthy viable seeds. Some people don't wait long enough and the seeds that they plant sometimes grow sick. If you squeeze a seed between your fingernails and it has a hard shell, it's usually ready.