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A mini keychain LED flashlight can be a lifesaver when you need a personal light source during emergencies. If you are worried of being stranded in the dark without a flashlight, clip on a small LED flashlight to your keys now. These are made very small so that they do not take up a lot of room in your pocket or bag.
Most mini keychain flashlights are powered using coin cell batteries such as the LR41 or a single AAA battery in order to keep the physical dimensions and weight low. This limits the light output to 20 lumens maximum.
On the other hand if you do not mind a slightly bigger size, the Fenix PD10 is compact pocket keychain LED flashlight that uses a single CR123A battery to produce a very bright 190 lumens output based on its CREE LED. It is currently one of the brightest mini keychain flashlight for 2011.
The Surefire T1A Titan Variable-Output LED Flashlight is a very popular choice that uses a rechargeable CR123A lithium cell to produce a continuously variable light beam from 1 to 70 lumens. It is about 3 inches long and weigh only 2 oz with batteries included.
The above comparison is a physical compromise and you cannot expect a tiny LED flashlight to product a 500 lumens light beam output. Furthermore, a super bright pocket LED flashlight will drain the batteries fast which may not be a good idea when you are lost or cannot recharge the flashlight. If you want a powerful flashlight, it has to be bigger in size to accommodate the batteries. So choose wisely whether long battery life, size, weight, maximum brightness is more important for your needs.
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