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If you plan on using it for indoors you will need a gen 3 unit to not need IR illumination. Even top end gen 2+ units will need IR illumination indoors as they lack the gain of a gen 3 unit. I personally own an XR-5 tube from photonis which is an extremely high end gen 2+ tube and when using it indoors i'm almost better off using natural night vision since its gain is about half that of a good gen 3 monocular.
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