Research Of Long-Term Lighting Tests Of Led retrofit And Filament Lamps

The paper analyzes the results of comparative studies of the light and engineering characteristics of LED retrofit lamps and filament lamps of the A60 form factor of nine manufacturers: Uniel (Russia – China), JazzWay (Russia – China), Philips (the Netherlands), Ecola (China), Wolta (Germany), Feron (Russia), Rev (Germany), Osram (Germany), Forza (China) – luminous flux, power consumption, correlated colour temperature, luminous efficacy, flicker index, spectral distribution of the radiation flux density during 6000 hours of lamps burning. The test results show that: а) the measured value of the initial luminous flux of all LED retrofit lamps corresponds to the declared; б) the measured value of the initial luminous flux of filament LED lamps is lower than the declared values by an average of 19 %; в) high value of the luminous flux maintenance factor after 6000 hours of burning among LED retrofit lamps showed Uniel LED10 W 4000 К (94.5 %), Philips Essential LED9 W 6500 K (96.2 %), Wolta LX 12 W 3000 К (95.3 %), for JazzWay PLED-SP 10 W 5000 K and Ecola Classic LED10.2 W 4000 K lamps, the luminous flux maintenance factor was less than 90 %; г) the luminous flux maintenance factor after 6000 hours of burning of all filament LED lamps ranged from 91.3 % to 96.4 %, except for the Feron LB‑57 7 W 2700 K lamp – 89.3 %. According to the test results, only for the Uniel LED10 W 4000 K lamp, the measured values of the light and engineering characteristics and the flicker index, including after 6000 hours of burning, correspond to the declared ones. The high luminous flux maintenance factor after 6000 hours of burning allows this lamp to be classified as A-category in terms of decreasing luminous flux.