Infrared lights can come in handy. Trying to be discreet when shooting video in a dark place is the first example that comes to mind. Purchasing dedicated IR lights can be very expensive. By using some old floppy disks or a roll of film you can convert an average flashlight or incandescent light bulb to be a very powerful infrared light source.
As you can see from the video above, video passes through the given materials almost flawlessly yet any light source passing through it is almost invisible to the naked eye.
You can find a full write up on the experiment and examples of creating your own infrared lights at lucidscience.com
DIY: Infrared Light Converter originally appeared on tech.nocr.at on 2011/02/03.
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