A friend is ask me about just what size box is the right one for an outdoor Wall Light Fixture, like a "Jelly Jar" Light? Seems that the ones out there have no information as to what box the fixture fits and the stores don't like you opening the box to try and get this information. Is the Right Old Work Box the right one it seems a little large at least "Carlon" Brand is 3 3/8 yet there was another box that was about 1/4 inch smaller in diameter.
The box outside edge appears to be as large as the light and would make it not sit flush up against the flat wall surface and the box bevels down to the outside edge. Being these light are going outside would you not want it to mount flush up against the wall witha minimal amount of silicone around it to keep water out?
So what box is it and can you get it at Home Depot or Lowes or these just what the sell and need to go to a electrical supply for the right size box?