[Yangzhou solar led street light] How to detect the life of solar street light source

Select 5 LED street lamps , under the ambient temperature of 25 â„ƒ, use different currents to conduct accelerated life test, and get the mathematical model of light output attenuation: y = exp (-Î±t) where Î± = m Ã— exp (nI), y represents relative light Output, Î± represents the attenuation constant, t is the lighting time, m and n are constants, and I is the test current.

According to the test data about y and t obtained under different currents, the attenuation coefficient Î± about different lamps is finally obtained, so that the life value of the luminous flux maintenance rate is 70%. Using temperature as a constant acceleration stress, the expected life of the LED lamp at 70% failure criterion at 25 Â° C is calculated.

Select 5 LED street lamps with the same specifications, adjust the temperature of the oven, under the conditions of 50 â„ƒ, 80 â„ƒ, 100 â„ƒ, 120 â„ƒ, 150 â„ƒ, under the rated current and constant current conditions as the conditions of constant acceleration, record 5 groups of LEDs All parameters of the reliability test process: light output (illuminance or luminous intensity or luminous flux), test time, current, power, junction temperature, etc., so that the failure life at 25 â„ƒ is judged to be 70% of the expected life.

Yangzhou solar street lamp manufacturers, solar street lamp prices, the price of various series of street lamp consultation telephone is the same
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