Notes on this test
1. Battery life
Battery life is a very important consideration and performance index when we choose headlamps. At the same time, it is a problem that contradicts our increasing pursuit of the portability and high brightness of headlamps. Lightweight equipment has become a goal that many people continue to pursue. But the weight of headlamps is often inconsistent with brightness and battery life. If we want higher brightness and longer battery life, we can only increase the battery capacity. Larger capacity means weight. A friend often asks me whether a new portable headlamp of XX is available, which can be several hundred lumens for dozens of hours. Is it reliable? This is a relatively confusing problem in the current headlamp market, and this is the most confusing problem for most headlamp users.
Most people will understand the battery life as the duration of the headlamp under a certain brightness. In fact, according to the American ANSI/NEMA FL1-2009 flashlight measurement standard, the endurance time refers to the duration of the measured headlamp from the initial output power (starting to count 30 seconds after the finger is turned on) to the time when the output power drops to 10% of the initial output value Time (with new batteries), the headlamps cannot be extinguished or turned off halfway through.
At present, many businesses have neglected this point intentionally or unintentionally, and most headlamp users have misunderstandings about this! Only the data tested in strict accordance with the American measurement standard ANSI/NEMA FL1-2009 flashlight standard can be scientifically accurate. Many products advertise the highlight battery life for dozens of hours, which includes the time after the brightness is downshifted. If we test the endurance of a 300 lumens headlamp, the actual conclusion is the continuous lighting time from 300 lumens to 30 lumens.
2. Luminous flux
One of the most important parameters we pay attention to when choosing a headlamp is the maximum brightness of the headlamp in lumens. Lumen is the unit of the luminous flux of the headlamp, which reflects the total amount of light emitted by the luminous body per second, and the lumens reflect the degree of total light output.
Because it is difficult to conduct a more accurate brightness data test under amateur conditions, this test method passes the test of the battery output power (current and load voltage based on the maximum lumens of the two major brands of headlamps) under the maximum brightness. Calculate the luminous efficacy value of the headlamp, and then calculate the corresponding lumen value by measuring the battery output power at each time node. The multimeter used in the test is Eone VC104 digital multimeter.
3. Light effect
Light efficiency refers to the ability of a photovoltaic power source to convert electrical energy into light, and the unit is Lm/VA. The luminous efficiency of our commonly used fluorescent lamps is about 80Lm/VA, and the luminous efficiency of current good LEDs will be slightly higher than this value. Due to the conversion efficiency problem of switching power supplies, the overall luminous efficiency of the current brand headlamps value is mostly around 80. Therefore, the corresponding luminous flux can be obtained by multiplying the product of the test current and the load voltage by the luminous efficiency value, and the change of the battery output power basically reflects the changing trend of the headlamp flux. In order to reduce the test error as much as possible, a 0.1-ohm resistor is connected in series in the headlamp power circuit, the current value is converted by measuring the voltage drop on the resistor, and the load voltage of the battery is measured synchronously to calculate the battery power output. Then multiply by the luminous efficacy value to convert the luminous flux.
4. Is the lumen value the bigger, the better?
At present, most mainstream headlamp products on the market have brightness above 100 lumens. When people choose headlamps, they usually choose products with higher maximum lumens. Isn't that the higher the lumens, the better? The lumen value is a very important reference index. The higher the lumen value, the better the load capacity and the wider adaptability. Other indexes will also be better. The lumen value of the headlamp is important, but the headlamp performance's stability is equally important to avoid the danger of headlamp failure in the dark.
Regarding the brightness of headlamps, we often have this question in actual use. Why do headlamps with the same lumen number feel that the illuminance of a certain headlamp is not great, but we feel very bright. The main reason is that the light intensity and the illuminated area are different, which produces completely different lighting effects. At the same time, different light colors have very different light effects. At present, most of the LED lamp beads used in headlamps are white or medium-white light sources, with high luminous efficiency, stable quality and long life. When we choose headlamps, we need to make careful considerations according to different use environments.
In our actual use, it is difficult to say how many lumens of brightness you need. It should be considered comprehensively according to the environment and the different needs of individuals. In complex environments, high-speed running, high-brightness environments suddenly switch to low-brightness environments, haze days, rainy days, etc., higher brightness is required. At the same time, due to the adaptive ability of the human eye, the demand for brightness is constantly changing. We can flexibly adjust the brightness during use and achieve a longer battery life while meeting the brightness.
The main parameters of the two headlamps
Rechargeable LED headlamp IPX65 waterproof headlamp can provide 300 lumens of power, combined with its mixed beam, making it an ideal choice for outdoor activities such as mountaineering, running, hiking and backpacking. It is equipped with a lithium battery charged by a standard USB port, which is compatible with standard batteries without the need for an adapter. The red lighting retains the night vision function. Its reflective headband can help you see when light is shining and is equipped with an emergency whistle.
Endurance time: the highest brightness is 350, the endurance time is 2 hours; the standard brightness is 100 lumens, the endurance time is 7 hours.
1 LED main light, 1 LED white light, providing a maximum output of 300 lumens. There are progressive dimming and strobe settings and can be turned on independently without bypassing the white light mode. PowerTap sensing technology brings fast switching between full-intensity lighting and step-less dimming so as to instantly increase the light intensity in high beam and low beam modes. It can be set to full-intensity low beam and high beam lighting, step-less dimming, strobe warning, red night vision and switch lock mode. Intelligent brightness memory allows you to directly turn on or turn off what you want without returning to full brightness.
Endurance time: The maximum brightness is 300 lumens, and the endurance time is 40 hours.
Appearance comparison of P and BD headlamps
Both P headlamps are made of the plastic shell. The P headlamp is lighter, and the BD is stronger.
Both light strips are elastic webbing; the width is similar, P is slightly wider than the BD light strip, about 25 mm, but thinner; BD is about 23 mm wide and slightly thicker; BD light strips are softer. The length adjustment of the two light strips is very convenient and can be operated quickly. The contact surface between the back of the lamp body of P and the head is small, and the lamp body and the light strip can be slid; the contact surface between the back of the lamp body of BD and the head is large, and the connection between the lamp body and the light strip is fixed.
The first feeling after receiving the P headlamp is lightness. The actual weight without batteries is only 58 grams, and the weight with lithium batteries is 80 grams. If Nanfu alkaline batteries are used, the weight is 91 grams.
The most unexpected appearance of the P headlamp is obvious. Not only is there no sealing ring at the junction of the two sides of the warehouse cover, but there is also actually a half-millimeter wide vent seam. What is the solution to the good IPX65 waterproof? Open the battery compartment; the headlamp is a triple-shaft structure as a whole, which is very convenient to use.
There are two lamp beads on the front of the P headlamp, the short-range floodlight is in the middle, and the dense vertical grille on the glass mirror is helpful to increase the view on both sides; the horizontal grille on the remote spotlight is good for going forward The light in the direction diverges. There is also a relatively small blue light, which is mainly used for night light and rescue warnings.
The function operation keys are located on the top of the headlamp; the operation is very simple and easy to use. Floodlight, medium intensity light, high-intensity light cycle, long press for two seconds to switch between red light. The back of the headlamp and the head contact area adopts a curved design so that the contact surface of the headlamp and the head fit more closely. The front is slightly inclined downwards, which is more in line with the actual use angle; the four-speed ratchet of the headlamp has an up and down adjustment angle of about 40 degrees, which is convenient for adjusting the illumination angle during running.
The P headlamp compartment is equipped with a dedicated rechargeable lithium battery, and it is also compatible with three AAA batteries, which is very convenient in use.
The reflective safety sign of the P headlamp has a very obvious reflective effect under the light.
A life-saving lock is also integrated into the light strip.
It is also lighter. The measured weight is 66 grams without batteries. The weight of Nanfu alkaline batteries is 112 grams, which is slightly heavier than the P headlamp.
The BD headlamp structure is more sealed. There is a thick sealing O ring at the junction of the box cover and a fastening buckle on the side to ensure that water does not easily run in.
There are also two lamp beads on the front of the BD lamp, the large one in the middle is a long-range spotlight, and the side is a short-range floodlight.
The function operation keys are located on the top of the headlamp, which is highly functional. They can switch between functions and brightness by single, double-click, and long-press. With a swing sensor, you can control the switch with just a wave of your hand. The open and close function (long press for 4 seconds) can ensure that it prevents misoperation when not in use.
The back of the headlamp uses a curved design where the headlamp is in contact with the head, making it more comfortable to wear; the five-speed ratchet of the headlamp has an up and down adjustment angle of about 50 degrees, which can meet different angle adjustment needs.
The battery compartment in the BD headlamp compartment is very compact and uses three AAA batteries.
In high-intensity cross-country races and other outdoor activities, it is inevitable to encounter bad weather, so the headlamp must have a certain degree of protection. Otherwise, it may bring great safety hazards to users in a dark environment.
1. Waterproof test of P headlamp
The waterproof rating of the P headlamp is IPX65, which means that water splashing on the shell from any direction will not cause harmful effects.
Because I was a little skeptical about the XP65 waterproof rating of the P headlamp, I decided to conduct an autopsy on the headlamp first to resolve the doubts in my mind. Open the cover, unscrew the two fixing screws of the inner tank, and then carefully take out the structural inner tank. It is found that the headlamp circuit board is exquisite in workmanship, and there is a concave ring in the inner cavity, which forms a closed cavity with the sealed O ring of the shell. The main circuit board is all sealed in the cavity, and moisture is not easy to penetrate. The horn-shaped light pipe connected to the housing can better illuminate the light emitted by the LED lamp beads evenly.
After reinstalling the inner bladder board, I decided to use the shower faucet to turn on enough water for a 10-minute rain test. The light is normal. After the test, dry the outer cover and check the inner wall. It is found that the outer wall of the battery and the inner wall of the outer wall are wall-mounted. There are a small number of water droplets, but it does not affect normal use.
Based on the sealing structure of its mainboard, it was decided to carry out a five-minute soaking test on the headlamp with the battery removed.
After removing the headlamp and drying the water droplets, reinstall the battery immediately, press the button, and the light will light up as usual.
P headlamps can cope with bad weather conditions, such as dampness, rain, or sudden falling water. It can still work normally even if water enters for a short time. This is because the circuit board of the P headlamp adopts a sealed structure, and its battery contacts are also adopted. It is made of stainless steel, and a layer of waterproof material is attached to the sensitive parts of the main headlamp board. However, in order to prolong its service life, it is not recommended to continue using it after the water has entered. Let dry before replacing the battery.
2. BD headlamp waterproof test
The protection level of the BD headlamp is IP4, and it will not affect the product in 1M deep water under normal temperature.
After opening the cover and unscrew the four fixing screws of the inner tank, it is found that the headlamp circuit board is also exquisite in workmanship. There is a sealing O-ring at the junction of the box cover. After the cover is closed, the entire inner tank structure is completely sealed in the box...
Reinstall the inner tank, install the battery button, fasten the fastening button, and put the headlamp in a bucket about half a meter deep for a half-hour immersion test. The test result shows that the BD headlamp can be used normally after being immersed for half an hour. Dry the case and open the lid to check that there is no trace of water ingress. It can be seen that the sealing performance of BD headlamps is quite reliable, and the IP4 waterproof level is sufficient to cope with heavy rains and other wading environments.
Comparison of the facula of the two headlamps
P headlamps, BD headlamps, the spot colors of the two headlamps are different, and the color of the P headlamps is purer.
1. P headlamp
The light spot has a creamy white color, the central area is brighter, the peripheral light spots are more uniform, and the brightness transition between the central area and the edge area is relatively gentle.
The actual field illumination effect is also quite good. In the strong light mode, the brightness is higher, the highlight lighting lasts for a long time, the irradiation distance and the field of view are good, the mid-range brightness is normal enough to cope with the general road environment, and the highlight can cope with more complicated conditions. The use environment.
2. BD headlamp
It also has quite high brightness, the light color is also close to milky white, the light spot effect is good, the brightness of the center area is brighter than the P headlamp, but although the four corners have local color distortion, it has little effect in the actual road environment.
The field of view around the close-range illumination is wider than that of the P headlamp, and the stepless dimming can adjust the brightness in a larger range, but its brightness drops faster during use. BD headlamps pay more attention to the diversity of functions, but the operation will be relatively complicated.
Battery life and brightness measured.
1. P headlamp
P headlamp data introduction 300 lumens battery life is 2 hours, 100 lumens battery life is 7 hours. Measured in a normal temperature environment, the battery life of 300 lumens is 2 hours and 16 minutes when the lithium battery is used, and the battery life of 300 lumens is 2 hours and 20 minutes when the Nanfu alkaline battery is used; when the lithium battery is used, the battery life is 100 lumens. The time was 7 hours and 30 minutes, which exceeded the official data time.
The result was not ideal in the actual measurement of the battery life for the first time after receiving the headlamp. After 1 hour and 45 minutes of the test in the highlight mode, it automatically enters the low-light mode, which is more inconsistent with the data. The second road test found that the battery life was increased to 118 minutes, and the crux of the problem was discovered after multiple charges and discharges. The new lithium battery must be activated after four or five charges and discharges before the battery capacity can reach the best value. It can be seen from the data that after five times of charging and discharging, the lifetime of the P headlamp in the highlight mode has been measured to reach 136 minutes. At the 10th minute of the test, the brightness of the P headlamp dropped from 350 lumens to about 180 lumens. In the following time, the brightness was relatively stable and maintained until about the 100th minute. Only when the battery voltage dropped did the brightness appear more Significant decline until the voltage of the lithium battery drops to 2.9V after 136 minutes, and the brightness enters the low-brightness protection mode.
The battery life of the P headlamp using a lithium battery in the mid-bright mode is measured to reach 450 minutes. The brightness decreases slowly with the extension of time until the lithium battery's voltage drops to 2.9V after 450 minutes, and it enters the low-brightness protection mode.
Next, use the alkaline battery to conduct the actual measurement of the highlight mode, and found that the battery life also reached 2 hours and 20 minutes, but the difference with the lithium battery is that the downshift is faster when the alkaline battery is used, and the brightness is lower.
2. BD headlamp
The online information on the battery life of BD headlamps is rather vague, and it is a bit foggy. It is measured that the battery life of 350 lumens is 4 hours and 30 minutes when Nanfu alkaline batteries are used in a normal temperature environment, and the brightness after 4 hours and 30 minutes is already lower than 10% of the maximum brightness. The actual measurement shows that the brightness dropped by almost half at about 5 minutes, and the brightness dropped to about 100 lumens after the 10th minute. After about 1 hour, the brightness began to drop significantly, and it was down to 50 at 3 hours. Lumens, by four and a half hours, it has dropped to 10% of the maximum lumen value.
Through the data sub-board, we can find a very interesting situation. We also adjust the P headlamps to mid-range brightness and BD headlamps to high-brightness mode. After the 10th minute, we can find that their time brightness curves are very close, and the battery life also dropped to about 10 lumens after 450 minutes. In fact, this is understandable because the lithium battery capacity of the P headlamp is 4.5WH, and the BD headlamp uses four Nanfu alkaline batteries with a capacity of about 4.5WH. The luminous efficacy values of the two headlamps are close，Assuming the same brightness; the battery life should be close.
The two products are adjusted to the maximum brightness in this test and placed in the refrigerator quick-freezing room at about minus 18 degrees. The output current and load voltage are measured every half an hour, and the change of luminous flux is obtained to evaluate its low-temperature performance. In the actual test process, the surface temperature of the battery of the P headlamp drops slowly, but it was originally thought that the BD headlamp has stronger sealing performance, and the low temperature should not affect much. The actual test found that the impact is still large, and alkaline batteries should be used with it. Related. In a frozen environment, the battery life of the P headlamp is reduced from 136 minutes to 105 minutes, which is attenuated to about 80%. The battery life of the BD headlamp is reduced from 270 minutes to 150, which is attenuated to 50%. About. The lithium battery of the P headlamp still has certain advantages in a low-temperature environment.
The low-temperature environment mainly considers the antifreeze performance of the headlamp, and the high-temperature environment mainly considers the heat dissipation performance of the headlamp. In fact, this is also a pair of contradictory issues. This time, the overall heating condition was observed through different time periods of the battery under the maximum illuminance. It is only for sensory observation and evaluation, and no precise test. The heating elements of the headlamp are mainly LED lamp beads under high lumens and the heating of the battery itself. Generally, lithium batteries The internal resistance is smaller than that of alkaline batteries, and the heat generation is smaller under the same working conditions. The test found that the two headlamps had similar heating conditions, and none of them showed higher temperatures. Although the brightness of the P headlamp is relatively high, the temperature is relatively normal after opening the cover due to the use of a lithium battery with small internal resistance and the heat dissipation seam on the housing. Although the BD headlamp is a fully sealed structure, the heat generation is relatively normal due to the low illuminance.
Fall resistance test
Since the headlamps are used in various environments, it is inevitable that they will sometimes be bumped. Whether they have a certain degree of drop resistance (impact resistance) is also very important. In this test method, both headlamps are installed with batteries. Afterward, free fall from a height of 1.0 meters to the floor tiles six times at different angles, and then observe the damage. The actual result is that there is no abnormality in the two headlamps, and the front edge of the P headlamp is slightly damaged, which does not affect the use at all.
Both the P and BD headlamps are lightweight, and the overall weight is well controlled, and they have a better close-fitting performance during the road running test, with less jitter. In particular, the P headlamp is even lighter when worn on the head, and the performance of the body is superb. At the same time, its supporting rechargeable lithium battery greatly reduces the usual cost of use.
Rechargeable LED headlamps IPX65 waterproof headlamps and professional ABS high-power COB luminous waterproof headlamps have high quality, and their maximum brightness can reach 300 lumens in a short time. Has a higher brightness. From the actual experience, P headlamps pay more attention to the practicability of the product, and BD headlamps pay more attention to the diversity of product functions. However, in terms of battery life and brightness, they are not constant brightness headlamps but one of the two. The main difference is that in the high-brightness mode, the P headlamp can still maintain a high brightness range for a long time after downshifting for a short time, which is suitable for environments that require high brightness for a long time; and After a short period of downshifting, the brightness of the BD headlamp will be lower than that of the P headlamp. It is suitable for environments that require long battery life. At the same time, it has an IP4 waterproof rating that is enough to deal with various wading or even immersion. Environment. When we choose headlamps, we should choose the headlamps suitable for ourselves according to different environments and needs.
At the same time, during the use of the headlamp, if there is a significant decrease in brightness, the battery should be replaced in time, and there should be an objective and scientific understanding of the battery life described in the information. Battery life, brightness, and battery capacity are closely related and contradictory. How can we more scientifically solve the problems of battery capacity and weight during the game? I personally recommend that you give priority to rechargeable batteries during training, and you can consider choosing time-resistant lithium iron batteries during competitions, which are easy to replace. At the same time, lithium-ion batteries have a large capacity (about twice that of ordinary alkaline batteries) and lightweight (AAA batteries are only 7.5 grams) /Grain), excellent ultra-low temperature performance (can work at -40 degrees low temperature).