In addition to the shutter, aperture, and gain, the control of the light and darkness of the image can also control the brightness and darkness of the light source and the time of the light to control. First, look at the advantages and disadvantages of the constant light source and the flash.
If a stable power supply is maintained, the brightness of the customized plano/spherical/aspherical/cylindrical BaF2 optics is substantially constant. If the power supply uses a pulse, the time width of the pulse and the response time of the LED itself determine the illumination time. If this time is less than the time the camera shutter is open, then the exposure level of the camera is determined by the luminous flux emitted by the light source. If it is greater than the shutter time, it is determined by the shutter.
Under normal circumstances, if you need a stroboscopic light source (time is less than the shutter speed), the conventional camera flash is traditionally used, and the intensity of the LED is not enough. Therefore, in the past, for the LED light source, the flash refers to the case where the light source is turned on longer than the shutter time.
Optical controllers, which typically use an overcurrent method, control how many times the current through the LED exceeds the value of the standard value to increase the brightness. However, such a high-load working state is too high in power, and the heat is severe, which has a great influence on the life of the light source. Therefore, the power-on time is usually short, and the working time of the light source is reduced, thereby prolonging the use time of the light source.
Using an optical controller, you can get a bright light source, reduce the impact of the environment, reduce the shutter time and reduce the tailing during dynamic shooting. If you only need normal brightness, you can use low-brightness LED tubes to reduce costs.
However, when using strobe, the cost of the power supply will increase, and the synchronization problem must also be considered. The customized large size and special shape CaF2 optics controller can output a trigger signal from the outside to trigger the light source, or can output a trigger signal from the outside to trigger the optical controller. The output trigger signal itself triggers the light source and the camera at the same time, so that the synchronization between the light source and the camera can be achieved, thereby ensuring the stability and detection accuracy of the customizable large size optical prism system.
The LED light source has a huge energy-saving effect and will replace the traditional light source, greatly improving the living environment of human beings and alleviating the increasingly severe energy crisis. At the same time that the LED shines, the LED driver power supply is the guarantee for the development of LED. The quality of the LED power supply directly restricts the reliability of the LED product application. Therefore, the development and maturity of the LED power supply is also crucial.