/usr/bin/rlux is in radiance 4R1+20120125-1.1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #!/bin/csh -f
# RCSid: $Id: rlux.csh,v 2.5 2003/02/22 02:07:30 greg Exp $
#
# Compute illuminance from ray origin and direction
#
if ( $#argv < 1 ) then
echo "Usage: $0 [rtrace args] octree"
exit 1
endif
rtrace -i+ -dv- -h- -x 1 $argv[*]:q | rcalc -e '$1=47.4*$1+120*$2+11.6*$3' -u
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