What is Infrared Light

IR film is sensitive to light just below what we can see in the visible spectrum. So let's start at the basics and talk about infrared light.

As the light spectrum goes, we have blue, green, yellow, orange, and then on to red and if we keep going down the line, infrared. Think of it, perhaps, as a very dark red.

We perceive different types of energy with our senses. Heat we feel with our skin, sound with our ears and light with our eyes. Our eyes are tuned to a certain area of the light spectrum and we can see from deep blue to deep red. On either side there is energy, but our eyes can't see it. Trying to describe with words to someone what light is that they can't see is exactly like trying to describe color to someone who is colorblind. That's kind of what we face.

One could argue that it really doesn't have a color because we can't see it. We call something green not because it reflects green light, but because our brain perceives it as green. We'd have to invent a new name for the color below red in the light spectrum if we suddenly were able to see it. I guess that's why they call it infra-red.

Robert Hall has put up a lot of effort to explain it all, and his site is a pleasure to visit
http://www.roberthall.com/

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