I have never had more yield with less light when it comes to auto's! If that is the case with the blue mammoth then i would not want to grow them. The genetic seem all over the places. With hermies and just inconsistent plants.The blue mammoth was not very mammoth and there was not much blueberry taste or smell from this strain. It may suite some people , but it just wasnt what i was looking for. Guess i just am stuck on my royal queen auto, critical,and there bluematic is truly a blue auto strain! It was ok if you wanted a couchlock and needed to sleep after you coughed your head off.