I built this in order to mount some cheap LED Light bars I got from Ebay.
http://www.ebay.com/itm/7x-Hot-LED-Tube-Light-Bar-White-Light-7W-12V-36LED-Garden-580LM-Lamps-Pure-/290854780330

I use these likes for aquariums and indoor gardening. I needed a mounting system that allows for mounting to vertical or horizontal surfaces and allows for the projection angle to be adjustable.

The files contain a single 2-part mount. Print 2 for each bar light you need to mount.

This version adjusts in 36-degree increments instead of the limited 90-degree increments