Hell,,I can grow killer Autos under T5s,,so Im sure ya can grow with (2x150)300 watts of HPS.
Me personally,,I dont grow Autos anymore. I like my Harvest from regular Strains.
i have used 150 watt Hps in my past Auto grows they work fine i would not do more than 1 or 2 plants at the most under a 150 and make shure your grow area is no bigger than about a 2x2 area or your gonna lose way to much light hope this helps and good luck