Did a large project last yr. which had several lights mounted on 6X6 granite bollards and several mounted on rock walls. The fixtures were designed to mount on 2 1/2" round poles or 2 1/2" conduit, so would be found in the pole light section of the catalog. Progress makes a round mounting flange which has holes to anchor down thru and also has a short upright section of 2 1/2" pipe which worked well on the perfectly level granite post tops.(These were very expensive 8 ft bollards with a hole drilled thru them lengthwise) These rock walls were without mortar, however, and the pillar tops at the ends where the lights were mounted had uneven tops, and varied spacing of rocks making anchoring impossible. We ran 3/4" PVC underground to the center of these pillar locations(before they were built) and left a stub up high enough to stick up 6" or so above what the rock wall builder gave us for height.
When we came back to install the heads, we took a section of 2 1/2" PVC(painted to match the head canopy) and slipped it down over the 3/4 PVC and worked it down in the rock pile far enough to give it strength, even adding our own various sized rocks for shims. The splices were made and tucked down in the 2 1/2" PVC, and the end product was all very servicible and removible, as well as sturdy.
Obviously, great care was taken to ground the fixtures.
This doesn't help with your down light application, but worked great for wall top lights. I know this isn't a UL listed solution, but after 2 or 3 trouble free years I am going to declare it PB (POORBOY) approved.
[This message has been edited by poorboy (edited 07-24-2005).]
[This message has been edited by poorboy (edited 07-24-2005).]
