wrote in message
...
The mounting plate is larger than the existing box and the holes to
secure the light are about a bit less than an inch outside the box
over the concrete wall. Would it be advisable to sink anchors in the
concrete to mount the light on? The light itself is secured to the
plate by 2 other screws from the back of the plate out through the
front of the light housing.

Thanks.

Installing anchors is O.K.. But, check the electrical parts area at a
hardware, HD, etc. for an adapter plate that screws onto the existing box.
The plate will have numerous holes and slots in it, so you'll find something
to match the lighting fixture mounts. If the fixture isn't tight against
the wall, you can always add a wall anchor or two to fasten the adapter
plate tighter to the surface.

TKM