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Taking dark images while warming up.  In chamber, at vacuum.  
Instrument pointed to:
  azi = -40
  alt = 0
  trans = 55
Those values do not show any trace of the mysterious
light in the chamber.  The light seemed to reflect off
surfaces at various points in the chamber, but moving
the stage from 120 to 55 appeared cause the source to
shadowed at roughly 65 or so.  And azi=-40 was dark
even without shadowing the source, so together this
should be dark.  The light was mostly seen with WAC
filter 2, and also barely with filter 8.  So WAC filter
9 should cut this light even more, so the darks
should be good.
Chamber gate valve closed.  Chamber porthole capped.
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