I think it would be easier to group growing sections in this sort of order:

Start with lighting as the main category. Have a section for Fluoros, HIDs, and LEDs (maybe incandescent if people are that damned foolish.)
Under lighting, go into mediums - soil, hydro, aero, etc.

From there, divide each of those subforums into the grow type - LST, SOG, SCROG, plain ol bucket grow, etc.

I think that's the most logical order to go if such a thing were to be accomplished and organized.