Кафедра механічної та електричної інженерії

Permanent URI for this community

https://dspace.pdau.edu.ua/handle/123456789/5119

Browse

Browsing Кафедра механічної та електричної інженерії by Author "Basova, Yu. O."

Now showing 1 - 1 of 1
  • Thumbnail Image
    Item
    Prediction of the service life of LED lamps based on the extrapolation of the luminous flux conservation factor
    (2024) Baghirov, S.; Basova, Yu. O.; Guba, L.; Kozhushko, H.; Басова, Юлія Олександрівна
    The paper presents the results of research into the luminous flux conservation factors of commercial samples of light-emitting diode lamps for general lighting during tests of up to 6.000 and 10.000 hours, as well as the results of their service life assessment based on the extrapolation of the values of the luminous flux conservation factor until the moment when this coefficient in 50% of the lamps will decrease to 70% of the initial value. The measurement of the luminous flux of the lamps was carried out every 1000 hours operation of the lamps in the mode with switching cycles: 150 minutes on at full power, after which the lamps are turned off for 30 minutes. Selection of the empirical curve of the luminous flux conservation factor should be performed by finding the initial constant and rate of change of the luminous flux using the method of least squares. The forecast of the service life, according to the recommendations of the IEC 62612 standard, was carried out for four times the test time according to the test results up to 6 thousand hours and 10 thousand hours. It is shown that the service life of lamp samples which can be declared based on test results, is up to 6.000 hours is at least 24 thousand hours (calculated 27.2 thousand hours). Forecast based on tests up to 10 thousand hours is about 36.500 hours, which is 3.500 hours less than declared by the manufacturer.