[Radiance-general] calculation weirdness

[Mark de la Fuente]

Hi all, I'm running a radiance calculation, and as always, I compare my radiance calcs with AGI to make sure I didn't mess up.  I know enough to be dangerous!  :)
 
My comparison consists of placing a calculation point 10' below an iesfile based light fixture.
 
AGI calc = 64810 lux
 
Radiance = 40,822 lux.
 
ies2rad -di -t white iesfile.rad
rtrace -w -h -I -ab 0 -aa .1 -ad 2048 -as 512 -ar 512 -ds .1 -aw 0 test.oct < input_pt.txt | rcalc -e '$1=47.4*$1+120*$2+11.6*$3'
 
OK, red flag, I've messed up somehow.  The numbers are off by 30%.
 
After almost giving up, I ran the same command but deleted the "-ds .1" and got 64844 lux!
 
What's going on here?  I would think source substructuring "-ds .1" would be better than the default (which I think is .2)  I appreciate your thoughts.
 
Mark

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