Don't know if this is a bug or I'm missing a setting but I thought the viewport was supposed to support unlimited lighting in high quality mode, I made a scene and after 24 lights the viewport stops showing the lighting for any additional lights. Here is a screen grab you can see that high quality is selected and the 25th light I created does not show lighting in the viewport.

Any ideas?

edit : I emailed this to sidefx support and they said its been fixed in latest daily build, 14.0.250, I checked and it was so consider this resolved, thanks SESI