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Laser tube: The irradiation distance is the longest, but the angle is very small. If the angle is increased, the distance becomes shorter due to limited energy. It can be seen that laser tubes are very contradictory in the security industry;
LED light-emitting diodes: This kind of application is more extensive, single tube life is very long, but the tube is large, the current is big, the heat goes up, the life will be shortened. At the same time, high currents can also cause fire hazards. However, these drawbacks can be avoided.
LED infrared lamp products are divided into red burst and no red burst two categories.
(1) Red-explosive products use an infrared led emission tube with a wavelength of 850 nm. During use, the infrared lamp emits dark red light when observed at close range.
(2) The infrared led emission tube with a wavelength of 940 nm is not used for the red burst product. In use, the surface of the infrared lamp does not have any light, so it is more hidden.
With the same camera, the sensitivity at 850 nm is 10 times better than at 940 nm. Therefore, infrared light with a slight red-storm at 850nm has higher efficiency and should be the first choice for infrared lamps.
Halogen bulb plus filter: the irradiation distance is longer and the power is larger, but the energy loss is also large. Because of the addition of the filter, most of the visible light is filtered and turned into heat energy, so the life of this infrared lamp is very short. There are many problems with the service;