To meet waterproof industrial led light rating requirements, ?P is within 10%, and the LED string voltage deviation percentage (?U) is calculated according to the expression [1] About 4. The author believes that the reasons for product power deviation are as follows: First, due to cost pressure, the production process cut corners and cut corners, eliminating the necessary product testing procedures, and substandard products were not eliminated in the factory and flowed to the market as shoddy products.27V, and the maximum value is 37.5W', the International Electrotechnical Commission also requires in paragraph 7 of IEC62722-1 that 'the deviation between the nominal value and the actual value of the electrical parameters of the lamp should not be greater than 10%'.

The specific analysis is as follows: According to the lamp The power calculation expression is derived: Pin-lamp nominal power△P-deviation percentage C-driving power efficiency U0-LED string forward voltage drop design central value△U-deviation percentage I0-LED drive current design central value△I -The deviation percentage assumes that the drive power accuracy (?I) is 5%. Fourth, in order to reduce the cost of purchasing LED lamp beads,

the lamp beads purchase did not select the LED Vf distribution BIN according to the design requirements, which caused the actual LED power consumption to deviate from the design center value.com For more information, please follow the LEDinside official website (, and the maximum value is 39. Thirdly, the thermal stability of the optional driving power supply of the lamp is poor, and the temperature drift of the output current is large, which directly causes the lamp power to deviate in a large range.

If a constant current precision 5% drive power supply is selected, the minimum voltage drop of the lamp string is required to be 34. Recently, various media have frequently reported incidents of unqualified LED light sources and LED lamps in random inspections by national and local quality inspection departments. The latter two causes have a strong correlation with the precision design of the lamp driving power supply. For example, the engineer chooses OSRAM LCW CRDD series lamp beads (Vf BIN table is as follows) 12 lamp strings with a design center value of 36V

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