In the fall of 2019, Gauss released a new version of the Qplus flat LED floodlights. I tested all the floodlights in this series and were surprised at the results.
IN series seven floodlights: 10, 20, 30, 50, 100, 150, 200 W. All spotlights have semi-matt glass and a half-meter long wire. The floodlights are designed for outdoor use at temperatures ranging from -40 ° to + 40 ° and have IP65 protection.
A ten-watt floodlight next to a two-hundred-watt one seems tiny.
In fact, it’s just a huge two-housed one: 44x35 cm and over 4 kg in weight. For estimating the size of a photo with a conventional filament lamp.
I'm already used to the fact that the overwhelming majority of LED products of domestic brands power and luminous flux are lower than stated, therefore the obtained measurement results are surprised.
The measured power turned out to be close to the declared one (it differs by less than 5%), but the luminous flux turned out to be much higher than the declared one, and the more powerful the model, the greater this difference. The 150W and 200W floodlights provide 41% more light than advertised. The measured luminous flux of the two-hundred-watt model was 28,200 lm (declared 20,000 lm).
I was so surprised by such results that even a suspicion crept in that the manufacturer gave me "gold samples" with improved characteristics, different from the production models. To check, I bought two 20 and 30 W floodlights from an online store.
According to the measured parameters, they turned out to be exactly the same as those received from the manufacturer, so everything is fair.
The color temperature of all spotlights is slightly lower (by 1-4%) than the declared 6500K. It's even good - the light is a little less "cold".
The color rendering index of all spotlights is 73-74. This is not enough for lighting living quarters, but it is quite enough for street lighting, for which such light sources are intended.
The light ripple factor of 30-200 W floodlights is about 20% - this is a "payment" for the ultra-high power factor, which for these models is above 0.99. Such a ripple is invisible to the eyes, but clearly visible through the smartphone camera.
The 10 and 20 W floodlights have zero ripple, but the power factor is about 0.5. In general, these spotlights differ from all the others in both electronics and LEDs.
On the packaging of 10 and 20 W floodlights, the operating voltage range is 200-240 V, for 30-200 W floodlights - 175-265 V. Indeed, when the voltage drops to 195-203 V, the brightness of 10 and 20 W floodlights falls by 5%, while floodlights 30-200 W shine without decreasing brightness when the voltage decreases to 130-150 V, depending on models. This allows the use of 30-200 W floodlights even where the mains voltage is unstable and can significantly decrease - unlike cheap spotlights, these will always shine with the same brightness and will not react to changes voltage.
Thanks to their massive aluminum housings, Gauss Qplus has good heat dissipation from the LEDs. After an hour of operation, the temperature of their bodies was 41-59 °.
The manufacturer gives a three-year warranty and claims a resource of 35,000 hours. It can be assumed that they really will work for a long time.
An important point. I have tested the new version of Gauss Qplus floodlights. They were released in October 2019. In some places on sale you can still find the old version of Qplus, released in 2018, and these are completely different floodlights. They can be easily recognized by the box (in the new ones it is made of matte kraft cardboard, in the old ones it is made of glossy and more yellow) and by the wire (in the new ones it goes down, in the old ones it goes back). When I was buying spotlights for testing, I came across an old 10W - look at the difference in the appearance of the boxes.
As an example, I will give the spectra and results for 150 and 20 W floodlights.
Luminous flux, color temperature and color rendering index were measured using a 2-meter integrating sphere and spectrometer Instrument Systems CAS 140 CT, power consumption and power factor by Robiton PM-2, ripple by 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. Before measurements, to stabilize the parameters, the lamps were warmed up for half an hour.
When testing the heating of spotlights, I was surprised by my cat Glafira. She calmly sat down in front of the floodlights and enjoyed the "artificial sun", while shining a total of 78,000 lumens on her at very close range. Even with one spotlight I had to work in dark glasses, and the cat was not at all embarrassed by such a huge brightness.
Gauss Qplus floodlights cost from 360 rubles for a 10-watt model to 4500 rubles for a 200-watt model. This is more expensive than cheap spotlights, but do not forget that for this price the buyer will receive an honest power, luminous flux higher than stated, good cooling, high quality workmanship and three years guarantee.
© 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.