One proviso...

There seems a hard-limit to emission per unit area when using 'super-ambient'. Unlike a 'real' Poser light, you can't just dial brighter and brighter. It 'maxes out'.

This is not a problem foe eg big ceiling light panels, but may be a nuisance for slim 'strip lights' and is a pain if scene's 'luminaires' are but a few pendant bulbs or wall sconces.

I've tried sub-division, the unit-area limit still applies. I've resorted to 'hiding' eg point-source lights inside bulbs. Strip-lights are harder...

FWIW, this unit-area limit seems un-documented...