Light decay and life test

Date:01-02-2019

2.6.1 Lamp aging method Lamp aging is carried out in an […]

2.6.1 Lamp aging method Lamp aging is carried out in an environment without forced ventilation and temperature control at 20 ° C - 30 ° C. The lamp is erected according to the normal installation posture, according to the nominal rated voltage of the lamp or the nominal applicable voltage range. The voltage is turned on and the luminaire operates at full power. During the aging process, the luminaire should be turned off no less than 2 times every 24 hours. The closing time should be 25-35 minutes, and the interval should be at least 30 minutes. The number of samples is not less than three. During the test, the lamp shall not be damaged or burnt, otherwise it will not be qualified.

2.6.2 The method of estimating light decay and life measurement replaces the luminous flux method by illumination method, and measures the horizontal illuminance value of one point per 1 meter at a distance from the center point and the axis along the road direction at a distance of 2 meters from the height of the lamp. 5 points, compared with the initial values of each point and the average maintenance rate value of 5 points. Between 2000-5000h, the average maintenance rate is measured every 336h; if the luminaire still meets the requirements at 5000h, the illuminance value of each point at 2000h is the initial illuminance value, and the measured illuminance value per 336h interval is The corresponding initial illuminance values were compared at 2000h and the average maintenance rate was obtained. The life expectancy at the average maintenance rate of 75% from the average maintenance rate fitting curve of the above 10 points plus 5000h is the life of the lamp. One of the street lamps was selected, and the luminous flux at 0-2000 h was measured by the photometric distribution test method, and the lumen maintenance rate of 2000 h was calculated as a calibration value. When measuring illuminance, the ambient temperature should be controlled at 25 ° C ± 1 ° C for more than 3 h.

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