I need very good lighting on my P1S print hotbed . As I did for all my printers, I decided to use a top ring light and I bought a cheap Ø260mm / 10" RGB bulb light on amazon.de / amazon.com. I could not find any design made for a RGB bulb and I had to make a completely new design. 

Anyway, four identical corner fittings and two sets of identical couplings. All to be assembled in one minute in a rigid frame. The ring light needs to be included during assembly.

I bought with my printer two sets of anti-vibration feet, no idea why, and I used one set for this design - but this solution works perfectly and without amortization.