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Solar street lamps use how long
LED is light, solar street lamps, solar street light how long can affect the normal use of the solar street light, it is recommended that the choice when choose long life LED light source, so how to detect the life of the solar street light?
select 5 LED street light, only under 25 ℃ ambient temperature, using different current accelerated life tests, it is concluded that the mathematical model of light output attenuation: y = exp ( - α t) Among them & alpha; = m× exp( nI) Relative light output, y said, & alpha; Time for attenuation constant, t light, m, n is constant, I for the test current.
according to the different electricity flow get about y and t test data, finally draw on different lamps and lanterns of attenuation coefficient & alpha; Calculated the optic maintain rate at 70% of the value of life. A temperature as the acceleration of constant stress, calculated under 25 ℃ failure criterion of 70% when the life expectancy of the LED lamps and lanterns.
how long can choose five solar street lamps the same specifications of the LED street lamp, to regulate the temperature of the oven, respectively in 50 ℃, 80 ℃, 100 ℃, 120 ℃, 150 ℃, under the condition of the rated current, constant current conditions as a condition of constant acceleration, record all the 5 groups LED reliability test process parameters: the light output ( Intensity of illumination and light intensity or flux) , test time, current, power, temperature, etc. , thus draws the failure judgment under 25 ℃ is 70% life expectancy.
that is solar street lamps light source detection method of life, through the above method can effectively detect the source of life. If you want to buy solar street lamp, can contact me.