Light pipe intensity photometric data

I measured the intensity distribution of one emitting patch of a lightpipe in 1988. The pipe used the 3M film, but had a square cross section and glowing sides. See the intensity distribution and the luminance distribution along the full lightpipe length at

The intensity distribution was measured approximately at the center of the length of the pipe.

Marin Moeck, Penn State


-----Original Message-----
From: [email protected] on behalf of Anthony J. Farrell
Sent: Thu 6/2/2005 10:56 AM
To: [email protected]
Subject: *** SPAM *** [Radiance-general] RE: Light pipe
Hi Giulio,

I am interested in your response regarding the light pipe problem of
Stefano. There are several correlations of light depreciation with lightpipe
depth, and of course the light pipe reflectance is key to this. Most light
pipes are 97 - 99 per cent specular reflective. Could you please elaborate
how one would implement the glow material and brightfunc relative to a given
relation and light pipe reflectance?



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