You should know that lasers are quite different from other sources of light in several ways. For a security system, two features are vital. While if you are using a light bulb or carrying a flashlight the light will fan out, a laser beam remains a narrow beam. Also, laser light will always be just one color. Due to the fact that laser light doesn't fan out, it can be transmitted a long distance and still hold enough energy within that small space to set off the detector of the security system.
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