1. What is the principle of strong light searchlight for portable lanterns
According to the optical properties of the parabolic reflector, the light emitted by the point light source placed on the focal point of the paraboloid is reflected by the paraboloid Then a parallel beam parallel to the optical axis of the paraboloid is formed. In fact, all light sources have a certain volume. However, due to the large diameter of the high-power searchlight reflectors, the diameter is close to 1m or more, so relatively speaking, the diffusion of reflected light caused by the volume of the light source is very small, and the luminous flux emitted by the searchlight is concentrated in a small solid angle. According to the basic concept of photometry, a certain amount of luminous flux is concentrated in a small solid angle, which will inevitably produce a great luminous intensity. The axial light intensity of a large searchlight can reach hundreds of millions of candela, and the projection distance can reach 200km. This is how searchlights are able to illuminate distant targets.
Second, the performance characteristics of searchlight
1. Flexible and lightweight: rotary switch for strong light and working light can be converted at will .
2. Waterproof and anti-drop: The structure is optimized and designed, and the material is made of imported bulletproof rubber material to ensure that the product can be operated under water of 50 meters, and the drop resistance can reach 1 meter without damage.
3. High efficiency and energy saving: the light source adopts German Osram, or imported HID bulbs, with high luminous efficiency, long life, strong vibration resistance, soft focusing, and the battery adopts a special super-capacity battery pack, no memory, cycle Long life, intelligent over-discharge protection, short-circuit protection, environmental protection and no pollution, with LED light source at the tail.
Modern searchlights are mainly used for ship navigation (such as marine searchlights) and signal signs. With the shortening of the lighting distance, the searchlight also develops to medium and small size. Medium and small searchlights generally use halogen tungsten lamps as the light source. Its filament has high brightness, small luminous volume and close to a point light source, and can be instantly turned off, but the light source has a short lifespan. There are also ultra-high pressure mercury lamps, metal halide lamps and ultra-high pressure xenon lamps as light sources, which have higher arc brightness and smaller luminous bodies, and the starting characteristics are related to the performance of the light source and trigger.
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