This LED lamp can safely claim the title of "World's Worst Light Bulb". Absolutely everything is bad in it: one hundred percent ripple, dangerous for health, the power is half the declared one, the luminous flux is two and a half times less than the declared one, the low color rendering index. Even the color temperature is not the same as indicated.
I bought this lamp called Ergolux LED-A60-11W-E27-4K for 102 rubles on Ozone. She interested me in a white box: all other Ergoluxes have green boxes and I thought that this was some kind of new series and decided to study it.
The code 3L1312105 is applied to the lamp, the attached instructions say that the last digits of this code are the year and month of manufacture, which means the lamp was manufactured in May 2021.
Using an Uprtek MK350D spectrometer integrating 50 cm spheres, a Robiton PM-2 power meter and a Lamptest-1 device, I measured the parameters of the lamp after a thirty-minute warm-up. The results are "impressive".
Having bought this light bulb, even the most unassuming buyer will be surprised: they promised that it will shine like a 90 W incandescent lamp, and it shines only a little brighter than a forty.
I will not even compare the declared and measured parameters, it seems to me that everything is clear without words.
I will only say that the lamp is built on a linear driver, which means that the brightness will decrease with decreasing voltage in the network and the light bulb will "react" with jumps in brightness to any drops in the network voltage.
The "inner world" of the lamp is obscenely simple: a diode bridge, a microcircuit, three resistors and seven LEDs. A place for a capacitor that smooths out pulsations is not even provided.
Although the MLS3535B microcircuit has eight pins, in fact there are only three of them - you can clearly see from the layout of the board that four pins on one side and three on the other are interconnected.
Unfortunately, there are more and more LED lamps on the market that should not be manufactured and to be sold: with one hundred percent ripple, twice (or even more), understated parameters, poor color rendering. Due to the crisis in logistics and the semiconductor industry, everything has risen in price and manufacturers of cheap lamps by all means trying to make sure that the wholesale price of lamps does not change, and this can only be done by reducing cost price. So they reduce it as much as they can, replacing full-fledged pulse drivers with cheap linear ones, throwing out smoothing capacitors from the circuit and selling them under the guise of eleven-watt five-watt lamps.
As the product manager of one large company said, if you see a lamp on the shelf of a store for less than 120 rubles and it shows the year of production in 2021, it will be 99% bad.
© 2021, Alexey Nadezhin
For ten years I have been writing every day about technology, discounts, places of interest and events. Read my blog on the site ammo1.ru, v LJ, Zen, Mirtesen, Telegram.
My projects:
Lamptest.ru. I test LED lamps and help figure out which ones are good and which are not so good.
Elerus.ru. I collect information about domestic electronic devices for personal use and share it.
You can contact me in Telegram @ ammo1 and by mail [email protected].