Alexey Karmin bought a pair of such lamps and brought them to me for a test.
The first lamp is 12 W 6000 K. In the B2OCLED Official Store, it costs $ 2.82 and is called "LED Bulb E27 3W 5W 7W 9W 12W 15W AC 220V 230V 240V LED Lamp CRI 90 High Quality Warm Light Bulbs High Brightness 3000K 6000K".
In the name of the lot and in the description, “CRI 90 High Quality” is repeated more than once, but the value of the luminous flux is not indicated.
We measure. Power consumption is 11 W (almost did not lie), the light flux is 941 lm (it shines almost like a 100-watt incandescent lamp), there is no ripple, but the CRI is about 84.
This is an ordinary LED bulb, but there are plenty of them on the market and they cost half as much. Alas, no high CRI was found.
The second lamp - 20 W 6500K was bought in the same store for $ 3.35. It is called "Super Bright LED Lamp E27 Light bulbs CRI 90 AC 220V 5W 10W 15W 20W 30W 40W Support lamps led Chandelier Cold White 6500K"
We measure. And here they thoroughly lied with power - only 12.5 W instead of the promised 20 W and the luminous flux is only slightly more than the first lamp - 989 lm. CRI is still around 84.
Well, in general, some Chinese progress is evident. Previously, mostly lamps with CRI 70 and lower were sold on Aliexpress, now they write 90, but in fact 84. :)
The moral is very simple. I still do not recommend buying LED bulbs on Aliexpress. Exactly the same bulbs of Russian brands are cheaper, and even have a guarantee of 2-3 years.
© 2019, Alexey Nadezhin
PS Luminous flux, color temperature, and color rendering index were measured using a two-meter integrating sphere and an Instrument Systems CAS 140 CT spectrometer, power consumption and power factor by Robiton PM-2, pulsation by Uprtek MK350D. In addition, using this device, a repeated control measurement of the color rendering index was made.
PPS As part of the Lamptest.ru project, I test for free lamas and other light sources for everyone.