Apologies if this has been asked before, but (and I seem to recall 
reading somewhere that ideally the only property of intensity, 
fade_power, and fade_distance that would need to be changed to be 
accurate to reality would be /intensity/) what, if any, unit of 
luminosity is appropriate to apply to a light source if 1 POV-unit=1 m 
and fade_power and fade_distance are both set to 1.0?  Does the 
resulting variable of intensity have any real-world analog, or is there 
any defined conversion factor?  Even an approximation would be useful.

Thanks!

--
Tim Cook

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