Infrared = 880nm Best choice in most opaque object sensing tasks. Provides longest possible sensing range in either Beam Make or Beam Break sensing modes. Best choice in hostile environments; useful in penetrating lens contamination. Preferred for use with small glass fiberoptic light guides Note: Do not use IR light with plastic fiberoptic light guides. Preferred when sensing dark colored objects in the proximity (Beam Make) mode, i.e., black, blue, green, etc. Useful in penetrating containers for verification of contents; also useful in detecting overlapped splices in dense materials. Color perception; tends to favor blue colored objects.