I order from bean farm but I would suggest to get a larger flex I got 4 inch on a bucnh of shelves and had to run 2 strips per shelve cause iy was not raisingthe temps enough for the snakes, and i have a space heater set to run year round most the time for when the ac causes it to drop. I will be ordering enough 11 inch to do both my racks ( the new one and redo the old one that has 4 inch. )