Hyrdoton mixed with soil? Im not sure how that would work! Hydroton is generally a hydroponic medium, not to be used with soil.
If its been under a 400 all its life Im sure that shop light would seem puuuuuuuny. Youll def need more light than what you have now. If you have it under 80 watts of shop light.. Im assuming its a 4 ft wide fixture, and then youre only looking at 20 w a square foot, and the general minimum is 50w. And thats the newbie way to figure it. Bump it up another 3 fixtures and youll be doing alright, make sure the light is within a couple inches from the plant top. Or invest in some CFLs and fixtures. Look at the lighting forum to figure out what would work best with your financial situation right now.