Today we will consider another product from the Xiaomi crowdfunding platform — an autonomous LED table lamp with an integrated ohm powerbank. In everyday life, there are often situations where you need high-quality and bright lighting without reference to stationary power and preferably compact and easy to carry. An option for such a device is our gadget today.
Buy Coowoo U1 LED Lamp on Aliexpress
Color temperature — 4000 K
Color Rendering Index — 83
Brightness — continuously adjustable
4000 mAh built-in battery
Charging Port — micro USB
Output ports — 2 USB A, up to 2.1 A
Glow time at maximum brightness — up to 8 hours
Standby time — 100 hours
Weight — 600 grams
Dimensions — 11 x 11 x 38 cm
The lamp is delivered in a white cardboard box, everything in the tradition of designing ecosystem devices — black and white printing, drawing device and brand name. The box lists brief technical specifications that I have already talked about.
The packaging is well thought out — the lamp is firmly inserted into a special foam holder, everything is very well fixed, they are not needed for safety during transportation.
Two versions of the instructions are attached to the lamp — in Chinese and in English
The lamp consists of two disks interconnected by a flexible tube. The lower disk serves as a stand, it contains batteries, a port for charging and two ports for connecting external devices and a control button combined with a light indicator. On its lower side there are rubberized legs so that the lamp does not slide on a smooth surface. The lamp parameters are duplicated right there.
The upper disk is a lamp. LED strip inside it — located around the circumference. The inner side has a reflective surface, and the outer one is translucent matte, to create uniform lighting.
The tube — the holder — is easy to bend at the right angle, it is quite soft, but at the same time perfectly holds the given shape.
The lamp control is quite simple — a short press on the touch button turns the lamp on and off — holding — adjusts the brightness, alternately — increase and decrease. The button is also a light indicator — if it is necessary to charge the battery, and in the process of charging — it shines red, when the battery is charged — it shines blue. You can use the lamp while charging.
The lamp gives an even and bright light of a neutral shade. For me personally, 4000K is the most optimal temperature — it does not yellow and is not too cold. In the several days of use that preceded the review, the lamp has come in handy several times already, and just like a stand-alone lamp, for small jobs with electronics.
To evaluate the level of light, you can use this test in a dark room. Lighting is more than enough even for reading small text, at low brightness — it can serve as a night lamp. The lamp remembers its state — switching on activates the brightness level that was before switching off.
More details — in the video version of the review
It seems to me that the rate of change in brightness could be a little less, it’s also not very convenient that when the brightness is reduced, when the minimum is reached, the lamp turns off. It is difficult to catch the minimum moment — for the same — night light.
Autonomy and stress test
To test the duration of the autonomous light, after fully charging the battery, it took me three nights. The first two lamps were turned on at maximum brightness from 19 to 22 — about three hours each, plus or minus a couple of minutes, on the third one it worked for about an hour and a half, not reaching the declared 8 hours a little, but also not bad.
The maximum declared load is 2 A — in principle, it also pulls, although with a voltage drawdown, but within the permissible limit. Both USB ports are connected in parallel, and this is a common load.
For the discharge, I chose a current of 1.5 A, approximately the same as when charging smartphones. The voltage level was kept at the same level throughout the test, with a small voltage drawdown. Upon reaching the indicator of 3.37 A * h, or rather 16 Watt * hours, the lamp’s power bank turned off.
Given that the nominal voltage of lithium batteries is 3.7 volts, we get 16 / 3.7 = 4.3 A * h
The lamp pleased with its brightness, ease of use, which is ensured by lightness and autonomy. It will help out perfectly when the power is turned off, it will help with lighting in those places where it is not.
On the downside, I’ll take it — a too rapid change in brightness — or rather, a decrease in brightness, since the lamp turns off when the minimum is reached.