USB interface LED flashlights are the ones who really can't be verified, but the real popularity should be after Xiaomi launched the portable light generation products (non-rice powder, say wrong do not spray, if there is a source, please correct me, thank you). The price of commercially available USB LED portable lights ranges from 1-30 yuan. There are just a few different brands of products that are considered mainstream, and subjective evaluations are carried out in terms of price, workmanship and brightness.
First, USB LED portable light parameters comparison
Sorted by price, of course, this 1 yuan package of LED portable lights, it is obviously the brush sales. 6 LED lamp beads , the power is unknown.
Common in the station is the recommendation of Best brand mobile power, as a good companion for mobile power, it is common sense to produce LED portable lights. Jingdong once had a 1 cent promotion, the daily price is 9.9 yuan, and the price of 8 yuan at the time of promotion is still acceptable. 5 LED lamp beads, nominally 1.2W power.
Well-known digital storage brand Shengchuang produced LED portable lights, touch function blessing, daily price of 9.9 yuan. 5 LED lamp beads, nominally 0.7W power.
Millet's generation of LED portable lights listed price of 19.9 yuan, encountered sales of 9.9 yuan is also a constant price. 6 LED lamp beads, nominally 1.2W power.
Adhering to the good reputation of the previous generation of USB LED portable lights, the millet grocery store launched an enhanced version at the end of 2015, maintaining the same price of 19.9 yuan, said to increase brightness by 50%, and support 5 levels of brightness adjustment. 10 LED lamp beads, nominally 2.5W power.
Second, work comparison
As can be seen from the figure, the millet-enhanced version close to 20 cm is the longest, and the other lengths are around 17 cm. The five portable lights are equipped with a matte soft lampshade to avoid the glare of the LED lamp. Because of the touch design, there is no aluminum heat sink, and the other four models have heat sinks on the back.
Let's take a look at this 1 yuan package of portable light, the plastic material of the lamp body has obvious odor, the handle is slightly rough, the edge of the lampshade has irregular cracks, the heat sink is basically useless, and it can obviously be felt after lighting for a few minutes. Fever, even after half an hour of continuous work, even a little hot, the accident is that this kind of portable light can be twisted to the highest degree, twisted into a twist can also work normally, but the built-in wire and shell are not tightly combined .
Personally think that the shape of the portable light is the best of these portable lights, fine workmanship without burrs, no touch, comfortable touch, resulting in bending due to the shape of the general.
The Shengchuang portable light uses a plastic case with a skin-like material. Although the touch is the best, the biggest drawback is that it is not resistant to dirt. Because of the design of the touch switch, there is no metal heat sink on the back, but the actual heat is not serious. It is worth mentioning that the touch is very sensitive, and the finger can be turned on or off by gently rubbing it.
In contrast to the millet generation and the enhanced version, in addition to the LED lamp beads rising from 6 to 10, there is an additional button for controlling the power supply. Compared with the inconvenience caused by the millet generation to use on the non-millet mobile power supply, the versatility of the enhanced version has indeed been improved.
The enhanced version of the power button is behind the USB interface, tap on, then Level 2, Level 3, Level 4, Level 5, and Off. The material of the outer casing is not significantly different from the hand.
Third, the brightness contrast
Use Sensorsense software to test with your phone's light sensor to ensure the same angle. The resulting illuminance results are:
Noble portable light 702lux; Best 1173lux; Shengchuang 1026lux; millet generation 1764lux
The millet enhanced version of the 10 LED bead brings a noticeable increase in brightness, and the coverage of the light is wider when the five levels of brightness are turned on.
Fourth, power comparison
The power comparison results of the four portable lights using the USB tester are as follows:
Miscellaneous brand 0.441W; Best 0.588W; Shengchuang 0.686W; Xiaomi generation 1.225W
The power of the millet enhanced version of the five levels of brightness are:
First grade 0.539W; second grade 0.588W; third grade 0.833W; fourth grade 1.225W (equivalent to the power of millet generation); five grade 2.352W
Five, evaluation summary
The original intention of doing this evaluation is that I think that the portable light of 1 yuan can also be used. Compared with the more expensive products, what is the difference? The first is workmanship. From the outside, the brand goods are indeed much better than the miscellaneous brands. There are also pictures of the brand's portable lights on the Internet. After seeing it, the internal difference is also very big. Secondly, the price, the difference between 1 yuan and 10 yuan seems to be very large, but there is no comparability in terms of actual use. In combination with these portable lights, first remove the miscellaneous cards; Best's brightness is too low, remove; Shengchuang's shell is not resistant to dirt, and there is no heat sink, removed; Xiaomi's first generation light source is obviously yellowish, and now it has been removed , remove; so it is recommended to buy millet enhanced version, five levels of brightness can be adjusted is more practical, just a separate purchase to calculate 10 yuan shipping is a bit uneconomical, it is recommended to buy a single or wait for rice noodles when the promotion package. Finally talk about the use, lying in bed to see the phone is the normal state of most people, although this bad habit is difficult to change, but put a portable light on the pillow can still indirectly reduce the damage to the eyes, compared to ordinary table lamps, LED portable lights consume less power.
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