Linear Light

The linear light in the latest SR6 Rhino 5 doesn’t seem to work as I would expect. The illumination it throws is the wrong shape! The light seems to be emitting from a point rather than from a tube. A similar thing is happening with the rectangular light.
See image attached.

This is only in opengl right? hasn’t it allwasy been like this?
Does it happen when you try to render the image?

Actually looks a bit different when rendered…