I think it is the strain. Only using some good dro seeds. Havent gotten enough balls to order some yet. But the lights are 2 300 watt cfls. I have 2 for flowering and 2 for vegging. Would like to use HPS but I really dont want my electric bill going up. Also, how many plants do you having growing or almost ready and what kind of weight do you think you will get. Jw