LED become more and more popular in illumination area, because energy saving, it can last more hours under the same power consume, so it also very good for flash light. And how to choose a good flashlight is most concern for people who want to buy a LED flashlight.
1) LED quantity: LED number should be moderate, generally not more than 12, the battery should be 2 to 3 as well, except other special needs. Generally, the high-power LED Flashlight can not reach the number of 12.
2) The welding: Each diode is connected to the circuit board by soldering, and all LED must be sold well, and if there is a bad welding, it may cause bulb does not light.
3) Batteries: there are two kinds of batteries, the ordinary and lithium types, although lithium battery is a rechargeable battery, but life expectancy is low as about 2 years, and LED life span is about 10 years, so you can choose according to the actual situation.
4) Brightness: a good LED flashlight with high brightness and low decay.
5) LED Consistency: When LED is off, it is difficult to distinguish the LED, so you can turn on the LED flashlight, and check the LED light consistency.
6) Waterproof: a good LED flashlight with waterproof function and anti-vibration. Since it is electronic product, it is very important to be waterproof.
7) Aperture: a good LED flashlight aperture is a uniform circle, and poor LED flashlight beam is divided into uneven distribution of yellow and blue. The LED flashlight unlike ordinary flashlight can adjust the focus, so you should be careful not to have astigmatism when purchasing.