See thread in p.b.i.  The scene uses two light sources, one to trace a 
cylindrical parallel beam through two prisms and across a room, and 
another, with media interaction turned off, to light the scene.  The 
latter light has a looks_like for what reason I don't remember.  (This 
was 12 years ago!)

When the scene is rendered as an animation, the looks_like is omitted in 
frame 2.

File beam0-pared-by37.log is the statistics from a v3.7.0 run with 
+KFF2.  File beam0-pared-by36.log is the statistics from a v3.6.1 run 
with +KFF2 +EF1.

POV-Ray versions:
   3.6.1 (g++ 3.4.1 @ i686-pc-linux-gnu)
   This is an official version prepared by the POV-Ray Team.

   3.7.0.unofficial [no source code alterations]
   Compilation settings:
     Build architecture:  x86_64-unknown-linux-gnu
     Built/Optimized for: x86_64-unknown-linux-gnu (using -march=native)
     Compiler vendor:     gnu
     Compiler version:    g++ 4.8
     Compiler flags:      -pipe -Wno-multichar -Wno-write-strings 
-fno-enforce-eh-specs -s -O3 -ffast-math -march=native -pthread

OS: openSUSE 13.2 (GNU/Linux)

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