Barneys Farm Blue Mammoth

This is a plant that my buddy had and he let me keep. I don't know how old it is but it is about 8 inches tall. What do you guys think any comments or thoughts, can I do anything to it to make it bigger. I currently have it under a 400 watt HPS light.

Disaster struck 2 days ago and my grow room over heated. The plant got toasted... I have since built a bucket swamp cooler and ordered a additional 6 inch booster fan to super charge the cooler. Im using a mixture of ice, water and frozen water bottles. I insulated the inside of the bucket with a double layer of bubble insulation on the inside. You can definitely feel this thing push out cold air and im very excited of the new one getting here soon.