I installed a bunch of Atlite battery backup LED exit signs at a local church about 2 years ago. Recently four have failed because the transformer overheated. I called the manufacturer (Atlite is part of Cooper) and the first thing they asked was did I purchase them from HD or Lowes. No I didn't so they transferred me to a rep. Maybe they know something that I have been asserting all along, what you get at HD or Lowes may not be the same as what you get from the supply house.

-Hal