We diviided the led light according to the using eviiroment. Most of our product is the commercial LED Lighting
Commercial lighting is a term used to describe lighting that is used in commercial spaces, including auto dealerships, distribution centers, churches, factories, offices, and warehouses. Unlike residential lighting, commercial lighting is made to withstand more abuse and has a longer lifespan.
While the focus of residential lighting is often on aesthetics, commercial lighting is task orientated. Commercial lighting systems are designed based on what the application is. For example, in an office-type setting, you may see task lighting, which illuminates specific areas where employees need concentrated light to be able to perform their jobs.
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In some cases where the contrast between light and shade is too large, the general camera is limited due to the CCD's photosensitivity, and the captured image tends to be too bright or the foreground is too dark. In response to this situation, wide dynamic technology came into being and solved this problem better. Before this, the traditional camera will generally adopt the backlight compensation function to adapt to the occasion with large light contrast.
When the object in the field of view of the conventional camera is in high-brightness background light, it needs to look at the object at the entrance or outside the window. Usually the central backlight compensation (BLC) mode is used, which is mainly to improve the brightness of the central part of the field of view and reduce the field of view. Part of the brightness to achieve the purpose of seeing objects in the central location.
Backlight compensation, also known as backlight compensation, divides the picture into several different areas, each of which is exposed separately. In some applications, the field of view may contain a very bright area, and the included subject is surrounded by a bright field. The picture is dark and has no hierarchy. Since the signal level detected by the AGC is not low at this time, the gain of the amplifier is very low, and the brightness of the screen body cannot be improved. When the backlight compensation is introduced, the camera only detects one subfield of the entire field of view. The average signal level of this area determines the operating point of the AGC circuit. Because the average level of the sub-area is very low, the AGC amplifier will have a higher gain, so that the amplitude of the output signal is increased, so that the subject on the monitor is clear, and the subjective brightness difference between the background picture and the subject picture is greatly reduced. The visibility of the field of view is improved. Although backlight compensation improves the brightness of the subject, the image quality deteriorates more or less.
The technique of wide dynamics exposes twice at the same time, once fast and once slowly, and then combines to make it possible to see bright and dark objects on the screen at the same time. Although both are measures taken to overcome the problem of seeing the target in a strong backlight environment, the backlight compensation is at the expense of the contrast of the screen, so in a sense, the wide dynamic technology is the backlight compensation. upgrade.
Since the natural light arrangement is from 100,000 Lux to 0.00035 Lux at night, the indoor illumination is 100 Lux, and the illumination of the outside scenery may be 10,000 Lux, so when the camera looks out of the room from the window, the contrast between the two is 10000/100=100:1. This contrasting eye can easily see that because the human eye can handle the contrast ratio of 1000:1, traditional security surveillance cameras cannot. It has only 3:1 contrast function.
Therefore, when a security surveillance camera is applied to a scene with a large contrast of light and darkness or backlighting, the bright area in the entire image is overexposed, and the dark area is underexposed, while the brightest and darkest areas of the image cannot be clearly seen. Such as in the bank savings, import and other important places. Since the strong light from the outside of the window and the soft light from the fluorescent lamp on the ceiling may cause difficulties in the capture of indoor and outdoor scenes at the time, it is not possible to clearly photograph indoor and outdoor scenes with great contrast at the same time.
The images they take will have a background that is too bright. The foreground is too dark, or the background is clear. The foreground is too dark and the foreground is suitable for too bright backgrounds. The earliest solution is to use backlight compensation technology or to set up two cameras indoors or outdoors to accommodate larger light contrasts, but the effect is not ideal. The technology that expands the dynamic range arises at the same time, namely the wide dynamic WDR technology that is called now.
The wide dynamic representation is expressed in "multiples" or "dB". When 100IRE is used as the standard, the conversion formula is: NdB = 20log (V2/V1). The wide dynamic value of an ordinary camera (called V1) is 10dB, such as a wide dynamic of 48dB, and the difference between a common camera and a video camera is 38dB, and V2/V1=80, which shows that the wide dynamic difference with an ordinary camera is 80 times, and the third generation of Panasonic The wide dynamic camera is 54dB, V2/V1 = 160 times. The ISD-A10 camera on the pool has a typical dynamic range of 95dB, V2/V1 = 17782 times, a maximum wide dynamic range of 120dB, and V2/V1 = 316227 times. From the “multiplier†point of view, cameras with Pixim DPS technology have a much wider dynamic range than the CCD's wide dynamic range.
The minimum illuminance of a wide dynamic camera camera is that when the brightness of the subject is low to a certain extent, the amplitude of the video signal output by the camera is reduced to 50%--33% of the standard amplitude 700mV (video nominal value is 1V, The standard value is 700mV): The other minimum illumination is the illuminance on the CCD, which is the sensitivity of the CCD. The illuminance of the CCD is much lower than the minimum illuminance of the camera. Many unscrupulous traders label the lowest illuminance of the CCD as the lowest illuminance of the camera to deceive the unsuspecting person. This is particularly reflected in some domestic OEM products and some No-name, low-end camera products.
The CCD wide dynamic technology uses a special DSP circuit to perform the most suitable shutter speed exposure for the bright area, and then exposes the dark sector with the most suitable shutter speed, and then recombines the two images for DSP processing to make it bright. Departments and dark sectors can be seen. Although this 160 times dynamic range technology has a large wide dynamics and realizes the optimization of image gray scales and other advantages, it has a high requirement for DSP performance. At present, CCD uses multiple exposure sampling methods, and the camera's wide dynamic range can only reach 66dB.
Wide dynamic technology is a technique that allows the camera to see the characteristics of the image under very strong contrast. When a high-luminance area illuminated by a strong light source (daylight, lamps, or reflection, etc.) and an area with a relatively low relative brightness such as shadow and backlight are simultaneously present in the image, a bright area of ​​the image output from the camera will appear white due to overexposure. The dark area becomes black due to underexposure, which seriously affects the image quality. The performance of the camera in the brightest and dark areas in the same scene is limited. This limitation is usually referred to as the "dynamic range."