I had these crazy large (63mm or 64mm) 50 watt halogen bulbs (with GU10 fitting) in my ceiling, but I couldn't find any LED lights in that odd diameter. So I quickly designed this adaptor to fit the normal 50mm diameter lights. I printed in white ABS as I worried about heat, but these lights actually don't give off too much. They're only 7 watt LED. It takes just under 40 minutes to print at 0.1 mm layer height with the Ultimaker 2. You can also download the Collada or Sketchup file (version 8 or higher) if you want to amend the design.