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Figure 22 - The 180 watts of intense infrared radiation can only be seen by video cameras
Figure 22 - The 180 watts of intense infrared radiation can only be seen by video cameras

It is difficult to capture the infrared glow using a digital still camera due to the infrared filter of the image sensor, so there is only a slight glow from the LEDs shown. A security camera, on the other hand, has no such filter and will pick up the infrared radiation in the same way it would pick up 180 watts of pure white light from a floodlight. Figure 22 shows the slight glow from the LEDs at very low power through a standard digital still camera. Besides the fact that the monitor does not work, it looks completely normal, and would not seem out of place in most installations.



Figure 23 - The massive LED array illuminates the small room like a spotlight
Figure 23 - The massive LED array illuminates the small room like a spotlight

The LCD monitor installation was a great success, and offered a very covert method to illuminate any room where computer equipment would not look out of place. The one way mirror can also be used to hide LED arrays behind photos frames, real mirror frames, and even small appliances that would have a dark reflective front panel. Other materials such as dark plexiglass or tinted glass will also work to conceal an LED array, and many materials that seem opaque to the human eye may actually pass infrared light. Certain papers and dark plastics will seem transparent to infrared light, but you will need to use an infrared LED and video camera in order to test them.

Figure 23 demonstrates what the security camera would see with the stealth infrared LED array running at only 25 percent of its maximum capabilities, lighting up a room as if a large spotlight was being used. When designing your own infrared LED array, the main factors to consider are cost of parts and the size of the array, so let your imagination run wild and give your spy cameras the gift of night vision.
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