I am having vinyl trim put around my eaves. There are two existing floodlights. I noticed when the installers removed the existing lights from the box and left the wires connected and the light hanging. They cut about an 1.5 in hole in the siding and that was it. The light was then screwed in to the vinyl with one Sheetrock screw.
I told them that an extension ring was needed to extend the existing box thru the vinyl and mount the fixture on that. They said that they never do houses like that. Most of houses they do, he says, don't even have a box. The electricians just run a wire out through a hole.
I can't believe that someone that installs this stuff daily can get by with mounting light fixtures with sheet rock screws.