Easy,  in a precision lab you NEVER turn off the lights.  That causes too big a 
temperature shift.  In fact,  a warm body is a 100 watt heat source.  That 
extra heat load can easily affect precision equipment.   And that's why zombie 
technicians are in such high demand... the undead are always at room 
temperature.
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what happens when you simply turn on the light?                                 
          
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