Stack-n-Grow Light Add On The Best Grow Light Technology in a Modular System that Grows with You! Frame is 100% recycled polypropylene?, Each shelf holds up to 110 lbs., Lights are 36" L, Includes 2 T5 high intensity full-spectrum bulbs Stores compactly in the off-season Fast, no-tools assembly **Base unit NOT included, need to purchase Stack-n-Grow System first**