About Neon Lights

 Neon has lasted for a hundred years since it first appeared in 1910. It is a special low pressure cold cathode glow discharge electric light source, and is different from other such as fluorescent lamp, high pressure sodium lamp, metal halide lamp, mercury lamp, incandescent lamp and other arc lamp. Neon lights are produced by a cold cathode glow discharge under a high voltage field of inert gas filled in a glass tube.

Choose flash, should consider many factors comprehensively. Here are some tips that I hope will help you. The key to buying a flash is to determine what type and how many functions you need. According to the energy (brightness), the flash lamp can be divided into three types according to the voltage of instantaneous discharge of the electrodes at both ends of the flash tube: high voltage flash lamp with voltage of more than 2500 VOLTS. The advantages of this kind of lamp are large output energy, high brightness, can meet the needs of large scenes and long-distance shooting. Disadvantages are large and bulky, inconvenient to carry. Therefore, in addition to the special needs of professional photographers, amateur photographers should not be selected. 500V flash, the output power of this lamp is moderate, can meet the requirements of light under general circumstances, easy to carry, performance is more complete, and more models, there is enough choice. It is one of the practical lamps for photographers and enthusiasts. Low-voltage small flash under 500 volts. This kind of lamp is small in size, light in weight, low in power consumption, cheap in price and wide in variety. It is suitable for professional and amateur photographers. The main function of flash is to illuminate the scene in the case of insufficient light and get the correct exposure of the image. Most digital cameras have automatic flash option. When the light is insufficient on the scene, the flash will automatically pop up and flash. Increase the shutter speed, a lot of times we use flash. This is not because the light is not sufficient for proper exposure, but because the shutter speed is increased to achieve the purpose of solidifying a moving image, such as a water drop or a moving portrait, which would be blurred and not clear if exposed at ordinary metering values. The flash can solidify these images. By increasing the depth of field, we know that the depth of field effect of an image is closely related to the aperture size. Generally, a larger aperture means a smaller depth of field. A smaller aperture means a larger depth of field. Using this principle, you can actually use the flash to increase the depth of field. Sometimes, due to the light limitation of the scene, we have to shoot with a wide aperture, but the depth of field is not enough, when using flash. We can reduce the aperture accordingly. Effectively increase the depth of field. Highlight the foreground, a lot of times we'll find in the scene. Background performance is not ideal or simply not what we want. At this point, we can try to use flash to exclude the background, because flash photography, the shutter speed is high, the background outside the flash projection area will not be able to show due to insufficient exposure. The foreground is properly exposed because of the flash, so that the foreground can be highlighted and background interference can be excluded. To reduce contrast, another common use of flash is backlighting. When shooting, it is very common to have too much light contrast in the scene (for example, portrait under backlight). Because the brightness range of CCD or film is limited, in a scene with too much contrast, whether it is for the bright part or for the dark part, it will cause the loss of some image details. In this case, it is a good practice for the dark part of the appropriate light, in order to reduce the picture contrast, of course, it is possible to reduce the light on the bright part. The flash is a powerful weapon in this situation! This is as simple as turning on the flash and letting it light up the dark parts of the camera, and it usually works well. Adjust the color temperature, in the electric lamp shooting, the photo is easy to show yellow, red warm neon lights, because the tungsten lamp color temperature is low, and add flash, you can effectively adjust the color temperature, so that the correct restoration of the color of the photographed object.

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