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How to chooes a flashlight?What will you care much when choose a flashlight?The apperance,the size, the weight or the function?
When choosing a flashlight, you'll first need to determine exactly what you'll be using it for, as one type may be great for certain activities but not forothers.
Following are the basic factors you may think about when choose a flashlight.

As with any other piece of hiking or camping gear, your flashlight needs to take the inevitable beating that comes with the territory. The best flashlights for rugged outdoor use are often made of aircraft-grade aluminum that can be used in harsh conditions for years without wear and tear. Some flashlights are constructed from a single block of aluminum—the same kind used on airplanes—and are completely compression sealed. Choosing a flashlight with such construction ensures that it’s shockproof, crushproof, and even water resistant, which doesn’t mean waterproof. While a water-resistant flashlight will suit you just fine in rain and snow, don't go taking it on an underwater dive with you.
Different sizes of flashlights are used for different purposes. You may need a light the size of a pen cap that fits on your keychain, or you may prefer a large aluminum clublike light most associated with security guards and police officers. The most common-size light for camping and hiking, however, is anywhere between four and six inches, which is an ideal measurement that fits your hand but won't stick out too far on either side. If you’ll be using it for backpacking and hiking, the lighter, the better. The best weight for rugged camping is about four ounces, but lighter options are also available.
The best camping flashlights will feature LED lighting, which have tremendously long lives compared to traditional incandescent lights. A typical LED bulb can last for as long as 50,000 hours, and is powered either by alkaline batteries or a rechargeable Lithium-ion battery.
When looking for a flashlight, the best ones for outdoor use have multiple modes that offer different levels of lumens, or the total amount of visible light the flashlight gives off. Flashlights can provide as few as six lumens of light and grow from there, with simpler bulbs maxing out at around 50 lumens. For the brightest handheld flashlights, which can be seen from as far as 120 meters away, go with a flashlight that provides between 150 and 160 lumens when operating on its high-power setting.Remember that when using your flashlight's high beams, so to speak, it significantly lowers its usage time. This can mean the difference between two and more than 10 hours of light. In some cases, a low setting gives you as many as 40 hours of run time.
Be sure to play around with the adjustable focus found on most flashlights to see exactly how pinpointed the beam can get. This feature gives you the freedom to use a flashlight as a broad source of light for around the campfire or for a uniform spot with a flood beam pattern. With the right focus beam, a flashlight can be seen from well over a mile away.
Lighting Modes
Lighting modes give you versatility with your flashlight. They are the different ways in which the flashlight gives off light. Lighting modes usually dim the flashlight, letting you choose how much light you need in a given situation; this also helps conserve battery life. Certain lighting modes flash the emitter, giving you a Strobe mode, and S.O.S. mode, which can also be useful.
Batteries are the fuel of a flashlight. Choosing the right flashlight involves choosing one that uses the right battery. Do you want a more commonly available battery such as the AA or AAA or do you want a higher-output, longer-lasting battery such as the CR123A or 18650.There are a lot more that can go into choosing a flashlight, such as the method of turning it on (tailcap vs. twist bezel),the texturing on the outside, methods of carry, etc.
Preparation is the key to safety and convenience when in the wild. Even on a short day hike, the unknown is always possible, whether it’s a storm you need to take shelter from, a twisted ankle, or a few hours of confusion trying to find the trail. Any of these could set you back enough for the sun to set before you make it safely to the trailhead, so having the right flashlight is essential to making sure you do.