Quote Originally Posted by Wild Bill
I don't know how long of a piece you plan on using, but the longer the strip the more of a temperature difference you can get from the beginning of the run to the end. To get more accurate temps shorter lengths are advised. I just finished a hatchling rack that holds 36 tubs (4' long and 34" tall) 6 tubs across and 6 shelves. I am running individual pieces to each shelf. What is also nice about this is I can just plug in the shelves I am using at the moment and not waste elctricity on the rest.
Same. I just finished 5 hatchling racks with 10 shelves each, did the same thing so I could control each shelf.

The only issue here is if your probe for t-stat is on shelf 3, and for some reason shelf 3 fails, solder breaks, stops heating, then the t-stat will jack the juice up to all of the other shelves, while that one shelf with the probe keeps reading room temp.

Solution to that is to have a backup t-stat set a few degrees higher that probe a different shelf and keep that from happening