Surveillance lenses (especially the common models) perform well in well-lit conditions, but their performance will decline significantly at night, in backlit or with intense light fluctuations. Although many surveillance cameras have basic wide dynamic range (WDR) and digital noise reduction functions, when exposed to extremely low light, the limitations of electronic enhancement become apparent, and the picture is prone to noise and severe loss of detail.
At this point, industrial light sources (such as infrared fill lights, white floodlights or special lights of specific wavelengths) play the role of the "sun". Its core function is to provide stable, controllable and sufficient lighting for the scene, solving the problem of insufficient light at the physical level and creating the best imaging conditions for the surveillance lens.
Effective matching requires choosing the appropriate light source based on the application scenario:
1. Infrared Light (IR Light) + monitoring lens (supporting IR correction)
· Principle: This is the most common and efficient combination. Industrial-grade infrared lamps emit infrared light that is invisible to the human eye but detectable by a lens (typically at wavelengths of 850nm or 940nm).· Advantage: Achieve truly light-pollution-free "invisible" night vision. When paired with a surveillance lens that supports infrared correction (IR-Cut), it can avoid focus shift during day and night switching, ensuring that the image remains clear at night.· Application: Perimeter defense, ports, oil fields, industrial parks and other places that require concealed monitoring.
2. White Light + ordinary surveillance lens
· Principle: In night scenes that require color monitoring (such as parking lots and square entrances), high-brightness white lights can provide full-color illumination for the cameras.Advantages: It not only provides the lighting required for monitoring but also serves as a warning.Note: It is necessary to avoid light pollution and glare to personnel.
3. Specific wavelength light source + dedicated filter lens
· Principle: For special industrial monitoring scenarios (such as fire warnings in factory areas and liquid detection), light sources of specific wavelengths (such as ultraviolet light) can be combined with lenses equipped with corresponding filters to capture specific information.· Application: It belongs to high-end professional applications and is not common in ordinary security.
Although there are many benefits to matching, the following points should also be noted:
Lens compatibility: It is essential to ensure that the surveillance lens supports infrared light imaging; otherwise, the image will be out-of-focus at night. Angle matching: The illumination Angle of the light source should match the field of view (FOV) of the lens to avoid being too bright in the middle and too dark around. Intensity and distance: Select a light source of appropriate power based on the monitoring distance. A light source that is too strong will cause overexposure of the foreground, while one that is too weak will fail to cover the entire distance. Heat dissipation and power consumption: Industrial light sources generate heat when working for a long time, so their heat dissipation performance and the overall power consumption of the system need to be taken into consideration.
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