ooooh, thanks!  I will bookmark that one!

Just as a last P.S. my final C7 results:  I tried 25%light in C7 without gamma:  3,6,15,30,62

And C7 with gamma:

25% light: 7,14,31,62,126

50% light: 10,20,44,88,179

75% light: 12,25,54,108,219

100% light: 15,30,63,126,254  (surprise! Matches Poser  WITHOUT gamma correction)

So Carrara does gamma correction very different compared to Poser. It seems that in C7, the light value is gamma corrected, but the texture RGB values not.