I recommend to print the mount in white (or the color of your choice) otherwise it may shine through.
I'm using it with two 5w LED Lights and have no problems with the temperature.
My LED Lights are very small. If you are using bigger ones they may stick out.
150mm x 76mm x 73mm
4 x M3 16mm screw and nut for the Gu10 sockets
2 x 3.9mm x 30mm srew and dowel for the wall mount
4 x 2.9mm x 10mm screw for the cover
Colido 2.0 Plus
80% mount, 40% cover