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Figure 18 - This illuminator is quite powerful, but runs extremely hot
Figure 18 - This illuminator is quite powerful, but runs extremely hot

The completed glass filter illuminator is shown in Figure 18, and can plug directly into a standard AC outlet. The illumination from this version is very strong and does block most of the visible light, but this comes at the cost of running extremely hot. This infrared pass filter will also work well with the low power flashlight bulbs, but is a little too large and thick to fit into the flashlight lens cover. Another decent light source that was tested on this filter was a round halogen motorcycle headlight running from a 12 volt DC power source. The resulting heat was slightly less than the incandescent bulb, but required a less portable power supply.



Figure 19 - This black light is a plug and play illumination source for video cameras
Figure 19 - This black light is a plug and play illumination source for video cameras

If you don't mind having a deep purple glow around the room, then the black light shown in Figure 19 will make a ready to use night vision illumination system right out of the box. Because the CCD imager in most security cameras can see ultraviolet light in the same way it can see infrared light, the black light makes it easy to illuminate a scene with light that human eyes cannot see. The downside to the ultraviolet light is that it also casts a low level of visible violet light and will run as hot as a toaster within seconds of use. Interesting side effects of the ultraviolet illumination include phosphorescence of certain materials and the ability for many digital cameras to pick up the ultraviolet light, which is strong, around 250 nanometers.

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