Might mean (unverified): Device for viewing faint light emissions.
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We found 2 dictionaries that define the word luminoscope:

General (2 matching dictionaries)
  1. luminoscope: Merriam-Webster
  2. luminoscope: Wiktionary

Definitions from Wiktionary (luminoscope)

noun:  Any of various optical devices that have a built-in light source

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