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Vol. 26 (2023 year), No. 4, DOI: 10.21443/1560-9278-2023-26-4

Ashryatov A. A., Kuznetsov E. A., Smolin K. A.
Study of the lighting characteristics of Uniel retrofit LED lamps

The paper considers the photometric characteristics of LED retrofit lamps produced by the Russian-Chinese company Uniel: Uniel LED-G45-6W/4000K, Uniel LED-A60-8W/6500K, and Uniel LED-A60-9W/4000K, designed to replace traditional incandescent bulbs. During the research, comprehensive measurements of photometric parameters (luminous flux, power consumption, color temperature, color rendering index, ripple factor, power factor) have been carried out and the luminous efficacy has been calculated. The results of the measurements have been presented in relation to the supply voltage. Based on the data obtained, an analysis is carried out of the compliance of the initial measured characteristics of the lamps with the values declared by the manufacturer. The analysis of the emission spectra leads to the conclusion that the Uniel LED-A60-8W/6500K lamps are equipped with white light-emitting diodes, the spectrum of which consists of a blue emission band from the semiconductor crystal with a maximum at ~450 nm and a phosphor band with a maximum at ~560 nm, which converts some of the blue emission from the crystal into long-wavelength spectrum. The emission spectra of the Uniel LED-G45-6W/4000K and Uniel LED-A60-9W/4000K lamps, in addition to the blue emission band from the semiconductor crystal with a maximum at ~450 nm, contain emissions from two phosphors, the bands of which have maxima at ~560 nm (green) and ~630 nm (red), which results in a lower color temperature of the LEDs. The paper also provides a detailed analysis of the light power distribution curves, thermal operating conditions, and structural features of the lamps. The research results lead to the conclusion that it is advisable to recommend Uniel LED-G45-6W/4000K and Uniel LED-A60-9W/4000K lamps for use as light sources to replace traditional incandescent lamps because their photometric characteristics comply with the declared parameters and permissible deviations specified in the regulatory standards.

(in Russian, стр.12, fig. 10, tables. 3, ref 17, AdobePDF, AdobePDF 0 Kb)

Vol. 27 (2024 year), No. 4, DOI: 10.21443/1560-9278-2024-27-4

Ashryatov A. A., Kuznetsov E. A., Pashkov M. Yu.
Study of lighting characteristics of LED analogues of domestically produced linear fluorescent lamps

LED linear lamps are gaining popularity in various fields of application due to their advantages in energy efficiency, durability and lighting quality. The paper considers the designs of the tested LED lamps of domestic production by AVANLED company intended to replace fluorescent lamps T8 with a power of 18 W, and also studies their lighting characteristics. Structurally, the studied lamps are produced in two versions: with a transparent and frosted glass bulb. Analysis of the dependence of the electrical characteristics of the lamps on the network voltage (Uc) has proved that they are practically independent of changes in Uc within ± 15 %. The results of measurements of lighting characteristics have shown that most parameters correspond to the declared values: the error of color temperature does not exceed 5 %, the error of color rendering index is 0.1 %, and the pulsation index of luminous flux is within the declared 5 % and equals 0.1 %. The luminous flux at the nominal voltage of the network differs from the declared value of 1,000 lm, and the luminous flux of LED lamps with a transparent tube is less than with a matte one. The power of the lamps varies from 8 to 8.7 W, which does not correspond to the declared 9 W. The luminous efficiency of LED lamps with a color temperature of 6,500 K corresponds to the declared value. For LED lamps with a color temperature of 4,000 K (matte bulb), the luminous efficiency is 2.4 % higher than the declared value. The luminous efficiency of the remaining lamps is less than the declared value. Analysis of the spatial distribution of luminous intensity has shown that LED lamps with a frosted glass bulb are suitable for replacing fluorescent lamps in luminaires with mirror optics, and LED lamps with a transparent glass bulb are suitable for replacing fluorescent lamps in luminaires with a diffuser reducing the glare of LEDs.

(in Russian, стр.11, fig. 8, tables. 3, ref 15, AdobePDF, AdobePDF 0 Kb)