Hello, @mirko_585 said: By the way, I have a Sketchup Pro 7 and a VRay 01.5.30. Maybe my wish can only come true on the last VRay versions ? That's it ! Upgrade to the last version (1.49.01) !

Thanks Dingobruce !!! Your solution seems to work The only problem is it increases the rendering time a lot... But that's anyway better than when I used VRay lights to make the LEDs dots Thanks for your help, and have a very good day. Cheers mate.