1. Look at the number of heads, and the number of heads should be moderate. Generally, no more than 12 batteries should be used for household use. It is better to use 2 to 3 batteries. If it is larger, it will be a waste. For other special needs, you can determine it according to your needs. Of course, high-power High Power LED flashlights generally cannot reach 12 pieces.
2. Look at the brightness. A good LED flashlight has high brightness and slow attenuation.
3. Look at the light bulb. When it is off, it is difficult for the naked eye to distinguish whether it is good or bad. You can see the consistency of the light bulb when it is on.
4. Look at the aperture, the aperture of a good LED flashlight is a uniform circle, and the light spot of a poor LED flashlight is divided into two colors of yellow and blue, which are unevenly distributed. The condenser surface of the electric bead should be as concentrated as possible. Unlike ordinary flashlights, this kind of flashlight can adjust the focal length. When purchasing, you should be careful not to have astigmatism.
Internal structure
1. Look at the welding, the welding should be firm. Each diode is connected to the circuit board by soldering. If there is a bad solder connection, it may cause the electric beads not to light up or affect the overall use.
2. Looking at the battery, there are two kinds of ordinary batteries and lithium batteries. Although lithium batteries are rechargeable batteries, their lifespan is low, about 2 years, and the lifespan of LEDs is about 10 years, which can be selected according to the actual situation.
external structure
1. Look at waterproof. A good LED flashlight has waterproof function and good shock resistance, that is, it is resistant to falling. Since it is an electronic product, there is a circuit board on the front of the flashlight, which is prone to short-circuit and damage once water enters.
2. Look at the appearance, you can choose the aluminum alloy shell, which is beautiful and generous.
3. Look at the appearance, according to the specific use occasion and purpose, you can choose the appropriate size flashlight.
