How to detect the life of solar street light source

May 08, 2023

Select 5 LED street lamps , under the ambient temperature of 25 ℃, use different currents to conduct accelerated life test, and get the mathematical model of light output attenuation: y = exp (-αt) where α = m × exp (nI), y represents relative light Output, α 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 α 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 ° C is calculated.

Select 5 LED street lamps with the same specifications, adjust the temperature of the oven, under the conditions of 50 ℃, 80 ℃, 100 ℃, 120 ℃, 150 ℃, 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 ℃ is judged to be 70% of the expected life.

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