I keep seeing that kid in the sidebag whenever my neighbour fires up his Harley. Not a bad thought...

..nice detail with most downlights, is that they can be angled and pointing in different directions...

Yes, that is why all downlights here are directed towards my better half's wardrobe while mine is left in darkness...

Thanks for this. Your technique is interesting. And design is very nice. It seems the cutout is less important than I thought in terms of using lights placed above the ceiling. Still, in the normal 3D view the ceiling is visible inside the lamp, whereas with the cutout it is not. But for rendering it seems your way of doing it saves the detour. I put a quick experiment with and without cutout in SourceForge 3D models 400 with the lamps from thread 7108.


And just to complete the cutouts for reference with SVG file for visualisation:
Pink:
[font=courier new]M 0,0.5 A .5,.5 0,0,0 1,.5 a .5,.5 0,0,0 -1,0 z[/font]
Red dash:
[font=courier new]m 0,0.5 a .5,.5 0,0,0 1,0 a .5,.5 0,0,0 -1,0 z[/font]
(pink is absolute, red dash is relative - shape is the same)
Blue (rounded corners):
[font=courier new]m 0,0.2 a .2,.2 0,0,1 .2,-.2 h.6 a .2,.2 0,0,1 .2,.2 v .6 a .2,.2 0,0,1 -.2,.2 h-.6 a .2,.2 0,0,1 -.2,-.2 z[/font]
Green (circle cut 10% from edge):
[font=courier new]m .1,.5 a .4,.4 0,0,0 .8,0 a .4,.4 0,0,0 -.8,0 z[/font]

ok