I have tested a huge number of LED lamps, but LED lighting is not just a lamp. Armstrong LED ceiling lights (60x60 centimeters squares) are now used everywhere and they, just like LED lamps, are good and not very good, and their real parameters do not always correspond to what is indicated on the package.
I tested six such fixtures from five manufacturers.
Most modern lamps of this format have an external driver unit, due to which the lamp itself is very thin - 8-11 mm. All tested fixtures have exactly this design. Behind the fixtures there is a short wire with a connector (usually round 5.5 mm).
Drivers.
Luminous flux, color temperature and color rendering index were measured using a
two-meter integrating sphere and a Instrument Systems spectrometer , power consumption with a
Robiton PM-2 instrument, and pulsation with a
Uprtek MK350D instrument . The minimum operating voltage, at which the luminous flux decreased by no more than 10% of the nominal, was measured using a
Lamptest-1 device, Stable Stab Instab
500 , LATP Suntek TDGC2-0.5 and an
Aneng AN8001 multimeter . Before measurements to stabilize the parameters of the lamps warmed up for half an hour.
The results pleasantly surprised me. I assumed that cheap panels may have a low color rendition index and a high level of light ripple, but all the panels tested have a color rendition index greater than 80 and actually have no ripple (only the Navigator panel had a ripple factor of 2.1%, but this is also very small) .
All panels have a declared power of 40 W, and their luminous flux is declared from 3200 to 4350 lm.
The luminous flux at the Shining panel turned out to be 23% less than what was stated (4350 lm promised, and in fact only 3328 lm). The three panels (Wolta, Navigator, X-Flash 4000K) have a slightly lower luminous flux, but within acceptable limits. The Light Technologies panel has a luminous flux that is 7% higher than the declared one, while for X-Flash with a warm light, it is as much as 18% more than stated.
All panels have a frosted "glass" and a uniform distribution of light on it.
The lighting technology panel turned out to be the brightest, but it also has the highest energy efficiency - more than 115 lm / W.
All panels have a high power factor - 0.95 - 0.97.
The Lightning and Shining panels work when the supply voltage drops to 155 volts (they may have identical drivers, at least they have the same enclosures). The Navigator panel is capable of operating at a voltage drop of up to 56 volts, an X-Flash panel up to 84 V, but a strange thing happened to the Wolta panel (more precisely, the driver) Wolta. When the voltage decreased, the panel began to flash, then when it increased to 70 V, it caught fire, but then the driver began to heat up and burned. For the first time I encounter the fact that the driver of the LED lamp or lamp burns when the voltage drops. Of course, in actual operation, a decrease in mains voltage from 230 volts to 70 volts is hardly possible.
The Wolta and Shining panels have a two-year warranty, Light technologies and the Navigator have a three-year warranty, and X-Flash has the largest warranty — five years.
I do not yet have the technical ability to check the lamps for the level of electromagnetic radiation and electromagnetic compatibility, and judging
by the results of testing the Fair Position Association, many LED panels do not meet the requirements for these parameters.
I tested only six models of panels, and there are more than a hundred of them on the market, so of course you should not draw conclusions that all 60x60 panels on sale are good, but I have no complaints about the quality of the light on all six panels that I tested.
PS According to
GOST R 55702-2013, the diameter of the photometric ball must be at least six times the length of the light source. For 60-cm panels the ball should have a diameter of 3.6 meters, and I used a two-meter ball. However, Instrument Systems software allows you to calibrate with the compensation of the size of the light source, measuring the light of the auxiliary lamp in an empty ball, and then in a ball with the light source placed inside. Of course, I did this calibration before measurements. I am almost sure that I fit into the permissible accuracy of measuring the luminous flux of 10%, and most likely the measurement error does not exceed five percent.
© 2018, Alexey Nadyozhin