Features:
Made from easy to find materials; online sources included
Made from inexpensive materials (under $60 -- compare at $299.95)
Materials list with part numbers is provided; suggested tools list, as well
Custom tray for humidifying plants during Winter and Autumn months
Construction with materials you may have on hand for further reduced cost
Can be made in a few hours completely with hand tools - great weekend project
24 inches (2') by 48 inches (4') of growing area (8 square feet) 
Optional choice of two or three light fixtures per tier to increase light intensity
Light fixtures are  adjustable three inches up or down from surface 
This light garden is light-weight compared to commercial units
Automatic timer to turn fluorescent lights on and off at selected times
Can be made as a portable (knockdown) unit for quick assembly/disassembly
Choice of single tier with storage space, or a two tier garden
Choice of stationary garden or rolling cart 
Easy to follow, step-by-step Instructions with photographs and/or  illustrations.