More recently, LED lamps were expensive, and now the stores are full of lamps for less than 100 rubles. Ergolux lamps, which say that they shine as 100, 120 and 150-watt incandescent lamps, can be bought for 67, 80 and 94 rubles. Let's see if they are really that bright.
On the packaging of the LED-A60-15W-E27-4K lamp, which costs only 80 rubles, excellent parameters are indicated: power 15 W, analogue of a 120 W incandescent lamp, luminous flux 1220 lm, color rendering index more than 80, power factor more than 0.7, lifespan 30,000 hours, ripple factor <5%.
Alas, all this is not true.
I tested four pear lamps that read 12, 15, 17 and 20 watts.
The real capacity turned out to be 27-39% lower than the declared one. In fact, these lamps consume 9, 9, 11 and 12 watts.
The luminous flux was 11-39% lower than the declared one. Funnily enough, the 12W lamp shines brighter than the 15W lamp.
The equivalent of an incandescent lamp is also significantly lower than declared (190 and 155 W are indicated, in fact 100 W, 120 and 100 W are indicated, in fact 80 and 85 W).
The color rendering index of the two lamps turned out to be 72 with the declared 80.
The color temperature deviates from the declared by 5-11%.
The specified supply voltage range does not correspond to the actual one. The 15 W lamp indicates "172-265 V", but already at 224 V its luminous flux drops by 5%, and at 172 V it burns fully.
The power factor on the lamp boxes is 0.7, in fact it does not exceed 0.5.
Three lamps are built on linear drivers, one on IC driver.
For three lamps, the ripple coefficient does not exceed 0.5%, for the LED-A60-15W-E27-4K lamp it is 7.3%.
All lamps work correctly with a switch that has an indicator (do not light up or flash when the switch is off).
The results of my measurements.
Reports for LED-A60-12W-E27-4K and LED-A60-15W-E27-4K bulbs.
Reports for LED-A60-17W-E27-6K and LED-A65-20W-E27-4K bulbs.
Luminous flux, color temperature and color rendering index were measured using two-meter integrating sphere and spectrometer Instrument Systems CAS 140 CT, power consumption and power factor of the device Robiton PM-2, device ripple Uprtek MK350D. The minimum operating voltage, at which the luminous flux decreased by no more than 5% of the nominal, was measured using the device Lamptest-1, stabilizer Calm Instab 500 and LATRA Suntek TDGC2-0.5. To stabilize the parameters, the lamps were warmed up for half an hour before measurements.
Unfortunately I cannot test how long these lamps will last, but judging by the only one year warranty, you can make appropriate assumptions.
I am not suggesting that you need to buy expensive LED bulbs. There are many cheap good lamps on the market, but the tested ones are difficult to attribute.
© 2020, Alexey Nadezhin
The main topic of my blog is technology in human life. I write reviews, share experiences, talk about all sorts of interesting things. My second project - lamptest.ru. I test LED bulbs and help figure out which ones are good and which are not so good.