The light spectrum is measured in the inverse or in the wave length, whichever is frequent. The wave length of light is measured in nanometers and one nanometer is equal to 1 x 10-9 meters.
The visible portion of this spectrum is between 380nm to 750nm range. The day/night optical cameras are manufactured in a way so that these can observe a wider spectrum than the human eyes. These optical cameras perform better with the assistance of IR illuminators.
In case there is very low illumination from the street lights or the moon, an IR illuminator can be used as a spotlight to use these cameras.
You can take the color filters off a regular RGB camera, you can then collect more light (monohrome), including in the near IR range.
you can also add filters to remove the visible spectrum if you need to.
an IR illuminator (IR light source) can be used then to illuminate the scene, and the camera will capture a decent image.
this will not work for far IR (thermal imaging cameras can be used there)
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