After testing some. The lights I turned invisible by unchecking the "visible" marker still had the light working, and not showing the geometry. They only quit shining light if I Unchecked "On", which turns the light off..

I did notice that if you uncheck visible and the select the light again, poser recheck the visible switch, so after you uncheck it, don't select the light again, else you have to uncheck visible again.

This in 11 Pro though, and you didn't state which version.

Also, I tried replacing the geometries for the lights with nulls(empty geometries) and this worked, but only in new scenes. Saved scenes still loaded the geometries.

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Consider me insane if you wish, but is your reality any better?