Possiby a bug, but one I like.
With sportlights, you can set the inner and outer cone angle.
If you set the inner cone angle greater than the outer cone angle, the spotlight turns inside-out
This means you can make lights like this:
(The spotlight is facing downwards)
If possible: Use this bug to make spotlights with angles > 180 degrees possible.
I’m not sure it’s worth ‘fixing’ to be honest.