I shared a three-eye flashlight that can be used for 15 yuan, but that one is a domestic lamp bead, some friends want to buy imported lamp beads, here is another introduction to the G40 flashlight with the highest cost performance at present, Alibaba and PDD can be found, the price is about 38-40 yuan, and it can be lower if there is a coupon.
In addition to the flashlight, there is only one white box + a data cable and a lanyard in the package, which were thrown away when they received the goods. G40 is a mid-head flashlight, the position of the red box is the key switch, the switch with a rectangular light is quite good-looking, the light is red when the battery is empty, and it is usually green. The keys are soft and easy to touch by mistake.
G40 net weight 150 grams, the total weight after installing the battery is 218 grams, the diameter of the lamp head is 38mm, the total length of the flashlight is 140mm, the body size is medium, and the portability is definitely not as straight as the 18650, but the 21700 lithium battery has a larger capacity and a relatively longer battery life. The aluminum alloy shell, oxidation process and workmanship seem to be relatively cheap, but you can't ask too much for this price, right?
Compare it with the R40 headlight on the left and the LD30R 18650 flashlight on the right:
Under the rubber plug on the back is the USB-C charging port, with a detachable clip, the waterproof ability can not be expected too much, at most it can be splash-proof:
There is no pressure ring on the lamp head, and it is an ordinary glass, it is easy to shatter and deform when it falls to the ground, and the smooth cup can slightly improve the ability to gather light, and inside is a most common Luminus SST40 lamp bead. Note that G40 also has a domestic lamp bead version, the price is only a few dollars, SST40 if you look carefully at the four corners of the square on the diagonal, the reason for taking pictures of light here does not seem obvious:
I opened it and looked at it and saw that it was an integrated warehouse (the lamp bead substrate and the barrel body are integrated), but the visual inspection of the manufacturer did not play thermal grease, in fact, I can accept the hollow warehouse at this price:
The tail cover and the positive electrode are springs, the stroke is long, and the 18650 battery and 21700 battery can be used directly, but if you use the 18650 battery, you must set a rotary tube on the battery, otherwise a little crooked may make the spring break through the battery skin and cause a short circuit in the positive and negative electrodes. The spring is iron, especially hard, the installation of the flat-head 21700 battery is particularly tight, the pointed one will be tighter, I installed a flat-head battery and put the negative pole for two days on the obvious indentation. It is recommended that the battery be purchased separately, and the merchant package is very poor, and the maximum power of the flashlight is 20W, and you can get it by finding a 21700:
Let's take a look at the effect of the irradiation. G40There are 4 gears,Single in order is to turn on the low bright gear、High bright gear、Shutdown,Press and hold the switch and don't let go of the machine is the extremely bright gear,Double click is the flash gear,Although there is no gear memory,Fortunately, the flash gear is not in the loop。 Shine on the wall and you can see that the main light spot of the extremely bright gear is very bright, and the spotlight is not bad, but there is a little dazzling feeling, and it is very green, of course, green is a common problem of SST:
I tried it outside the community, and the G40 long-range effect was actually better than expected, but the main light spot in the center was wrapped in a layer of green and was a little unpleasant, in fact, it was enough to turn on the low brightness gear when walking at night:
40 yuan flashlight, you can see that the light pillar visible to the naked eye is still very good, wow, the flood light is average, and the light angle is also very small:
Compared with the same SST40 lamp beads and the 2000 lumens of Sophion if24 together, it can be seen that the G40 concentrating effect on the left is better with the blessing of the deep light cup (the camera ISO value is deliberately increased here to reflect the effect), and the light column of if24 is invisible after reaching a certain height;
Finally, according to the usual practice, a downshift is measured. Of course, the flashlight at this price is a direct drive, and when fully charged, the extreme bright gear lasts for just 2 minutes and then downshifts, and then the brightness has been slowly declining, and it is not until 7 minutes later that it gradually stabilizes. Through multiple tests, it is determined that the G40 adopts time downshift instead of temperature control downshift, and the brightness change of the two downshifts is still obvious, and when downshifting, you can intuitively see that it has darkened a lot:
In terms of temperature control, the actual measurement is lit indoors, and the brightness of the lamp head reaches about 40 degrees in 2 minutes, at this time, the temperature on the barrel body can be felt rising, and the temperature of the lamp head is as high as 47.6 degrees after 4 minutes, and the temperature is gradually transmitted to the barrel body, which becomes difficult to hold, indicating that although G40 is a medium-head flashlight, the heat dissipation capacity is not very good:
The main disadvantages of this G40 are general workmanship, tight springs, fewer gears, downshifts with time, poor temperature control and heat dissipation capacity, etc., but it has 2000 lumens, imported lamp beads and the price is only 40 yuan, these shortcomings are nothing, and even better than some hundreds of yuan of pit goods, used as a spare tube, rough tube or loan tube can be, in the search for cheap flashlight friends to try it.