Equipment knowledge outdoor headlights how to choose?
The headlamp, as its name implies, is a lamp that is worn on the head and is a lighting tool that frees your hands. When we are walking in the night, if we hold a flashlight, there will be a hand that cannot be left free. In this way, we cannot deal with accidents in a timely manner. and so. A good headlight is what we need to have when we walk the night. In the same way, when we were camping in the evening, wearing a headlight could free our hands to do more. 1. Alkaline batteries are the most commonly used batteries. Its electrical energy is higher than that of lead batteries, and it cannot be charged. At low temperature 0F, it is only 10% to 20% of power, and the voltage of Voltage will be significantly reduced when it is used.
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Headlight's common battery
2. Nickel-cadmium batteries: It can be charged thousands of times, it can maintain a certain power, it can not be compared with the stored energy of alkaline batteries, at a low temperature of 0F is still 70% of the power, rock climbing The process is best to carry a high-energy battery which is 2 to 3 times higher than a standard battery.
3. Lithium battery: It is 2 times higher than the average battery power voltage, a lithium battery's ampere / 2 times more than the two alkaline batteries, at 0F like at room temperature, but expensive, its voltage can hold Constant. Especially useful at high altitudes.
The three important performance indicators of headlights as outdoor headlights must have the following three important performance indicators: 
1. Water resistance, it is difficult to avoid rain on the outdoor camping on foot or other night work, so the headlights must be waterproof, otherwise a rain or flooding will cause the circuit short circuit to extinguish or flickering, causing security problems in the dark . In the purchase of the headlights, it is necessary to see if there is a waterproof mark, and it must be more than IXP3 waterproof rating, the larger the number, the better the waterproof performance (the waterproof rating is no longer recounted here).
2. Resistance to falling, a well-performing headlight must have a resistance to fall (impact resistance), the general test method is 2 meters high free fall without any damage, in outdoor sports may also be wearing loose and so on The phenomenon of falling down, if the shell cracking caused by falling, the battery off or internal circuit failure, even if the search for the battery in the dark is a terrible thing, so this headlamp is certainly not safe, so in When buying, you must also see if there is a drop mark, or ask the owner about the headlight's resistance to falling.
3. Cold resistance, mainly for outdoor activities in northern regions and high altitude areas, especially the headlamps of split-type battery boxes. If poor-quality PVC electric wire headlights are used, it is very likely that the wires will harden due to cold. It becomes brittle, causing breakage of the inner core, so if you want to use outdoor headlights at low temperatures, you must pay extra attention to the cold-resistant design of the product.
Headlight Selection Tips If you are really interested in outdoor sports, you need to plan your lighting purchases. There is no lamp in the world that can cope with all your activity plans. You must choose the right luminaire based on your financial resources, personal preferences, activity purpose and environment, and consider the combination of them to use every possible activity. The most suitable lamps, while avoiding the repeated investment in performance. 
From the experience of some mountain friends: In spring, summer and autumn, princeton TEC 40 flashlights are used for nighttime walking lighting. Its high reliability, waterproofness, lightness, and high brightness are emphasized. Four AA batteries are maintained for 3-5 hours. Halogen high-intensity lighting, with a battery of spare batteries, is almost enough to cope with the possible night-time hiking needs in about 5 days of activities. ARC AAA LE pocket flashlight is also used as a headlight, used in night camps and tents, and it is extremely small and exquisite. Reliable advantage, a AAA power can maintain a stable 5-hour high-brightness LED lighting under the effect of voltage adjustment circuit, with 2 spare batteries, enough for 5 days of night use, both with all spare batteries weigh less than 400g, and at the same time The advantage of having two lamps is that it has extremely high system reliability, and at night, when a battery is replaced with a lamp, it is not enough to catch it. If it is the winter season, PETZL DUO BELT guarantees sufficient brightness, reliability, and working time. There is an external cold-proof battery box. The battery is powered by 4 C. The battery power is enough. Even if the battery is not used, AEC AAA LE ignores the weight and volume. Do not count but also bring, this configuration is also suitable for caving. There is also a long-term search for Maglite 6C. Future plans to purchase Surefire M2 for short-term night searches and purchase BD Spaceshot 2 for short-term winter use.
Suggestions for the selection of luminaires can be considered in the following order:
Reliable - Lightweight - Function - Upgrade - Recharge - Appearance - Price 
The specific explanation is to pursue maximum reliability while ensuring sufficient reliability. The function can be used. Consider whether there is an upgrade possibility. It is convenient to buy a spare light bulb and battery. The appearance and process are as good as possible. In the end, it is because individuals think that the most expensive thing is to save money. It is worthwhile to spend more money in exchange for a 1% safety factor in outdoor sports. So, try to establish your own buying principle and you will find your ideal lighting.
Cautions 1. Headlights or flashlights are important equipment, but they must be removed to avoid corrosion when not in use.
2. A few headlights are waterproof or even water resistant. If you think that waterproofing is very important, buy such a waterproof bulb. But it's best to be rainproof because the weather is not something you can manipulate in the wild;
3. The head lamp holder needs a comfortable cushion, some of which are pen-shaped and hung near the ear;
4. The switch of the lamp holder must be durable. Do not appear to put it on the backpack. It will turn on the waste of power or some situation. The switch design of the lamp holder is preferably a groove. If you think that the process will be a problem, it is best to use a patch. Close to, remove the bulb or remove the battery;
5. Lamps are not durable for a long time. It is best to use a spare lamp. Such lamps as halogen, helium, and argon will generate heat and be brighter than vacuum bulbs. Although the use will be high amperage and shorten the battery life, most The bulb will identify the amperage at the bottom, while the typical battery life is 4 amps/hour, which equals 8 hours at 0.5 amp bulbs.
6. Try to test the light in a dark place when buying. The light should be white, the spotlight should be better, or the spotlight can be adjusted.
7. A method of checking the LED: It is generally equipped with three batteries, first with two batteries, the third short-circuited with a key and evenly durable (compared with the headlights without a boost circuit), and lighting It takes a long time (about 30 hours for the brand name [AA] battery). It is ideal as a camping lamp (which is used in tents). The disadvantage of headlamps with a booster circuit is that the headlamps have poor waterproof performance (most of them are Not waterproof).
8. If you are climbing at night, it is better to use the headlight of the bulb as the main light source, because it has a light effective distance of at least 10 meters (2 AA batteries), and there are also 6 to 7 hours of normal Brightness, and most of them can be rain-proof, and then bring two spare batteries for one night without worrying about it (don't forget to bring a spare flashlight and use it when changing the battery).
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