Below are answers to common questions concerning infrared (IR) flashlights.
How far will your infrared flashlight work? This depends on
What is the difference between the frequencies? IR ranges from 725nm to 1700nm for the Near IR (NIR) range. Lights fitted with a low-cut IR filter, like a 715nm, will pass 715nm through 1200nm. Lights fitted with a high cut filter, like a 1000nm, will pass 1000nm through 1200nm. A 715nm light will emit a slight red glow when you look directly into the light. A light with a 1000nm filter will look completely black when on. However, a 1000nm filter will make the light less powerful since it is only allowing a smaller portion of light through.
This brings up a very important point. The lower you go, the better the light will illuminate, but it will be more visible. As you go to higher frequencies, the power of the light will drop.
What is best for my camera or NVD? You want to chose the lowest frequency possible while still maintaining the covertness you require. Lower frequencies will work better but won't be as covert.
Can you give me an idea of the different frequencies and covertness?
Typical Light Distance Ranges
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