I built this probably 15-16 years ago to start seeds in tray. It later evolved into a display unit in my on farm store. While remodeling the store and upgrading it to a commercial kitchen the old shelving unit found its way to the corner of a barn and was forgotten the last couple of years. Until I was cleaning some junk out of the barn yesterday and found it sitting there in the corner, begging to be put back into service. It is a small unit that only holds 12 flats of seed cells but that is quite a few plant starts for a hobbyist or homestead operation. I have not dressed it up to its full former glory in the pic. I have a clear poly sheet that latches on to the front and need to staple plastic to the back of it. The lights are phillips full spectrum bulbs and are $39 for 10 in a contractor case. The ballast are $11.99 cheap shop lights from home depot. Shelf unit was made from scrap wood, poly sheet was a deformed one from a greenhouse, and my total cost for the unit came in at around $100. Enough head room to go from germination to good size plants. And my light raising and lowering system is just a hole drilled in the shelf boards and the light chain fed up through the hole with a nail or length of wire through the chain to hold it in place. Making it very easy to raise and lower the lights, without fooling around with hooks in a tight space. It beats the heck out of those junky stand up greenhouse kits and cost about $1500 less than a comparable pro germination chamber.