SketchUp does not have light objects, nor true rendering.
It has either Sun angle lighting (with optional shadows,) or light from behind the camera eye.
There are some free renderers that have plugins for SketchUp.
I had contact last night with Tomasz via Private Message about some bad links to his site.
And he last made an update to the SketchUp plugin last 24 March 2015.
True he might not have released a rev to the app since then, but if there’s nothing to fix ?
I don’t know, I never get around to trying it.