Look at the light bulb
1, see the first few, the first few to be moderate. Household not more than 12 in general, the use of the battery in 2 to 3 as well, then a little waste, for other special needs can be determined according to need. Of course, high-power Hight Power LED flashlight generally can not reach the number of 12.
2, look at brightness, good LED flashlight high brightness, slow decay rate.
3, to see the light bulb, in the case of extinguished, the naked eye is difficult to distinguish between good or bad, you can see the light bulb in the light of the consistency.
4, to see the aperture, a good LED flashlight aperture for a uniform circle, poor LED flashlight spot is divided into uneven distribution of yellow and blue. Concentrate the spotlight as much as possible. This flashlight unlike the ordinary flashlight can adjust the focus, should pay attention when shopping, do not have astigmatism.
Two internal structure
1, see the welding, welding to prison. Each diode is connected to the circuit board by soldering, if the solder joint is not good, it may cause the battery does not light or affect the overall use.
2, look at the battery, there are two ordinary batteries and lithium, although rechargeable lithium batteries, but low life expectancy of about 2 years, LED life of about 10 years, according to the actual situation to choose from.
Three external structure
1, look waterproof, good LED flashlight with waterproof function, seismic performance, that is resistant to fall. Because it belongs to electronic products, flashlight front has a circuit board, once the water is prone to short circuit, causing damage.
2, look at the appearance, you can choose aluminum shell, nice.
3, see the appearance, according to the specific use of occasions and purposes, choose the appropriate size of the appropriate size flashlight.
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