how to see in the dark

• congo blue + deep red

• http://amasci.com/amateur/irgoggl.html

• https://www.led-strip.nl/producten/infrarood-led-strips/

• 730nm is visible by human eye

• led strips 840 - 845 nm https://www.led-strip.nl/producten/infrarood-led-strips/

• IR pass filter: https://www.rolight.nl/Home/Webshop/armaturen/kleurfilter-%252f-black-wrap/FIVELE181/LEE-filter-vel-nr-181-congo-blue

• Dat komt door de gebruikte golflengte, de 850nm IR leds zijn deels zichtbaar. De 910/940nm IR leds hebben dat niet.

Congo blue filers give your eyes a peak sensitivity of around 720nM. That's definitely into the IR band which starts at 700. If you want your vision to be much deeper into the IR, you can use a different Lee or Rosco filter, one with an even deeper IR cutoff. One such filter is Lee #120 "Deep Blue." This filter passes much more blue light than Congo blue, so you'll need to use three or four layers of Deep Blue, plus two or three layers of Primary Red.

850nm = security camera led floodlamp