[Radiance-general] ies2rad calculation

[Robert Franke]

Hi,

I try to understand how the ies2rad programm works, but I don't get it. 
The calculation of the three color channels in the description of 
material light  is unclear.

the lamp color (fluorescent ) is .373 .385 .85
http://www.radiance-online.org/cgi-bin/viewcvs.cgi/ray/src/cv/lamp.tab?revision=2.3&view=markup

lamp radiance for every channel = lumens/area/(WHTEFFICACY*PI) * lampcolor
area = 4*PI*r^2
WHTEFFICACY = 179
http://www.radiance-online.org/cgi-bin/viewcvs.cgi/ray/src/cv/lampcolor.c?revision=2.10&view=markup

This value 1.27324e+06 from my example is the inverse projected area of 
the sphere (1/(PI*r^2))

But where are this 0.907945 0.863233 0.476189 values from? This 
calculation (lumens/area/(WHTEFFICACY*PI) * lampcolor) doesn't match.

This is my example:

ies2rad -dm -t fluorescent Test.ies

IES-file
-----------------------------------------------------------------
IESNA91
[MANUFAC]
[LUMCAT] 2010_02
[LUMINAIRE]
[LAMP] Testlamp 1.000 lm 100W lamp*ballast factor = 1
TILT=NONE
1 1000 1 131 360 1 2 0 0 0
1 1 100 ....
.... .... ....

Output Data
--------------------------------------------------------------------
void brightdata Test_br
5 corr Test.dat source.cal src_phi src_theta
0
1 1.27324e+06

Test_br light Test_light
0
0
3 0.907945 0.863233 0.476189

Test_light sphere Test.s
0
0
4 0 0 0 0.0005
------------------------------------------------------------------------
Thanks,
Rob