Frequent friends who go outdoors often must know that the biggest advantage of head-mounted headlamps is that they can liberate your hands, so that you can use other tools more freely, then evaluate whether a headlight is excellent, in addition to lighting brightness, many Environmental applications are also indispensable. The Netcoil HC33 headlight received this time is such a distinctive headlight product.
Static display
Headlight body
Battery and headlights are individually packaged
After unpacking the express package, it can be seen that the battery and the headlight are separate and independent packaging. Open the headlight box, we can see the attached headlights, headlamp body, headlight hanging ring, spare waterproof ring, instructions and waterproof rubber cover. The product basically takes into account the long-term use of certain parts of the wear, can continue to use without paying extra consumption, is still quite humane.
Headlight body and accessories
Headlight body front
Headlight body side
Headlamp and headband connection
Headlight accessories
Taking into account the headlamp's irradiation direction, this headlight adopts the “straight lamp body + lateral illumination†mode. The user can use the headlight fixing ring on the headband to fix the headlight and manually align the headlight during use. The lamp adjusts the irradiation direction. According to the instructions, this headlight can be used for a 100-degree horizontal angular range and provides up to 1800 lumens of illumination.
LED lamp display
Headlight button display
Headlight battery
The biggest feature of this headlight is its matched 8A discharge current, 2900 mAh capacity, low temperature resistant 18650 battery with excellent performance at low temperatures. At present, the outdoor headlights below 300 lumens are mostly built-in lithium batteries and AA dry batteries, and their use environments are limited. The NL1829LTHP high-discharge, low-temperature lithium-ion battery was independently developed by NITECORE Naitekeer. It is specifically designed for low-temperature environments and greatly improves the cold-resistance of ordinary batteries. The technical parameters indicate that the low-temperature performance is 40°C below zero. So what exactly is the true effect, we will explain in detail in the following test. 
Battery pack front
Battery pack back
Battery indicates low temperature resistance
Batteries at the bottom of the battery labeled with NITECORE
Battery charging method
Removable lamp holder
Field test
Headlamp gear test
In order to better test the performance and characteristics of this flashlight, I used the occasion of the New Year holidays to come to Harbin, Heilongjiang Province to test in the frigid zone.
Test Location: Harbin Songhua River.
Test temperature: minus 25 degrees - minus 30 degrees.
This test is mainly to test the discharge time and effect of this headlight under low temperature conditions. The test time is 8-9 pm in the evening and the test temperature is as shown above.
The test environment is the Songhua River ice surface
Gear parameters
Low light
Bright gear
Highlight gear
Extremely bright gear
The irradiation distance is related to the headlight height
In order to allow everyone to see the headlight range more clearly, I put the headlight on the ice for testing. From the above picture, we can see that the headlights are roughly in line with the 110 degree horizontal illumination range marked by it. When placed on the ice, due to height restrictions, the headlights are about 10 meters away from the height, of course, this is not the height of our actual use, when I put the headlights to the chest position, you can see the irradiation distance increased to About 50 meters, if the headband worn on the top of the head, the best distance (visible to the naked eye) is about 100-120 meters, which is more than enough for night climbing or hiking. From the above figure, we can clearly see the brightness of the headlights commonly used in the four stalls, taking into account the relationship between life and lighting distance, I recommend the case of walking within 1 hour at night or a more complex environment, you can use the highlight stalls If it is a relatively simple outdoor environment, you can use the bright gear to improve the use of time; very bright stalls personal recommendation in the use of ice or snow for enhanced lighting, it should not be applied for a long time.
Comparison test
In order to better allow everyone to feel the effects of the headlights at the moment, I personally sought to compare the brightness of a 1000-degree brightness flashlight of other brands with the brightness of the HC33 highlights at 850 lumens. As can be seen from the figure, in actual users, the brightness difference between the two is not very obvious. The flashlights of other brands are larger due to the caliber of the lamp head, so they appear to have a larger irradiation range, but with it comes an increase in the volume of the flashlight. The length of this other brand flashlight is twice that of the HC33. The HC33 maintains a small volume when it provides a sufficiently bright illumination, which is very important for outdoor use. 
Left for other brands, right for HC33
On other brands, under the HC33
On other brands, under the HC33
On other brands, under the HC33
Irradiation test
It can be seen that the HC33 shines brightly near the midpoint of the spot on the ice surface. When the ice is irradiated at a height of about 1 meter, it can provide a circular illumination aperture with a diameter of about 3 meters. The aperture is from the inside to the outside. The brightness transition is gentle. Adjust to highlight brightness, headlights raised to a height of 1.5 meters, forward irradiation can obtain a horizontal range of 110 degrees, the front shot distance of a fan-shaped irradiation surface of about 100-120 meters, in this range of irradiated objects regardless of the contour or The details are all very clear, but it should be noted that since the environment I tested is a vast ice surface without reference objects, it may appear that the lights are slightly divergent, and if the environment is replaced with a jungle or mountain environment, the effects of irradiation will be different.
The transition from the inside to the outside of the spot is more uniform
Proper spotlight for close range center point
Illuminated ice surface is very clear
Long Shot Effect 01
Long Shot Effect 02
to sum up
Knightco HC33 headlamp provides a relatively strong irradiation effect in a compact size, especially when the 2800 mAh low temperature resistant battery is configured to have a more stable discharge efficiency than a normal 18650 battery when used in a cold environment. Lasting use of time. Headlights within the scope of illumination, the details of the restoration of the object is very true, it is convenient when used in outdoor applications, it is recommended to use the cold out of demand friends.
When I test the flashlight at the moment, because the outdoor environment is cold (below -25 degrees Celsius), the headlight battery is fully charged, and after the headlight battery is full, the headlight will automatically shift down to high after radiating for about 15 minutes with 1800 lumens. Brightness, after adjusting the highlight, the application will still automatically return to the highlight after 2 minutes. My personal guess is that the headlight's protection circuit automatically adjusts the brightness level according to the ambient temperature and the battery condition to obtain better battery life. If you want to use the headlight continuously in a low temperature environment, you can pay attention to this situation.
In general, the Knight Kerr HC33 headlight is a superior product, and continues the small and bright character of the Knight Kerr product. I hope to see this unique product in the future.
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