LED Blu-ray overflow may cause damage to the retina? Recent test results show that some commercially available LED lamps do have a certain risk when used abnormally. The Shanghai Municipal Quality and Technical Supervision Bureau of gesep.com recently organized a testing organization to conduct risk monitoring on some commercially available LED lighting products. It was found that out of 27 samples of LED lamps, there was one sample under moderate conditions of moderate risk, that is, Eyes are harmful to the retina when looking directly at the light source.
A number of experts suggested that the current "photobiological safety of lamps and lanterns system" standard should be adjusted from the recommended standard to a mandatory standard, and risk monitoring should be conducted throughout the country. In addition, the applicable color temperature for LED lighting products in different locations should also be specified.
Zhang Haijun, Honorary Chairman of the Shanghai Illuminating Society pointed out that the color temperature of indoor LED lighting products should not exceed 4000K, and LED lighting products with a color temperature of 5000K and above should be avoided.
Industry control printed circuit boards (PCB)
1. For industrial control, special or general-purpose circuit board, the bottom circuit is completed, and IO is reserved. After buying the industrial control circuit board, the input and output ports reserved on the circuit board are connected to the user's own device, such as motor, solenoid valves, sensors, thus completing the function want to accomplish.
2. The special circuit board is a board specially designed for a certain function, such as the temperature control circuit board. After buying it, the input port is connected to the thermocouple, and the output port is connected with a heating contactor or a solid state relay to control the heating device to complete the temperature control. There are flow control boards, motion control boards, etc.
3. The universal control board, most of which can be programmed, after the user's own secondary development, completes a specific function, and has a wide range of uses. For example, plc is a general industrial control board. After the user writes the program and compiles the input, various functions can be completed. Digital input, analog input port, high-speed counter port, digital output port, analog output port, and some also have communication function.
Industry Control Circuit Board
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