The shelves arrived yesterday, and I was able to put it all together today, and I think it is going to work out great. The shelves are heavy duty metal, with wheels. I zip tied the lights to the above shelf, plugged them all into a power bar, and presto! Each light is 30 watts has controls to turn off each bar independently. I might turn off one of the bars for the Haworthia shelves. I also had to cut the mat to fit on the shelf. It was about 3" too long. One down, three more to go. But I think the plants will be much happier.