1. The number of heads is moderate. Generally, household batteries should not exceed 12, and it is better to use 2-3 batteries. It may be a bit wasteful if used for other special needs, but you can determine according to your own needs
2. Welding should be firm. Each diode is connected to the circuit board by welding. If there is poor contact due to virtual welding, it may cause the beads to not light up or affect the overall use
3. The spotlight surface of the electric bead should be concentrated as much as possible. This type of flashlight does not have the ability to adjust the focal length like a regular flashlight. When purchasing, attention should be paid to avoiding astigmatism
4. The contact of the power switch should be obvious. This type of flashlight often uses a rotary switch, which turns on when tightened and off when loosened. If the contact is not obvious, it is easy to cause the phenomenon of turning on and off
5. Pay attention to waterproofing. Due to its electronic nature, there is a circuit board at the front of the flashlight, which can easily cause short circuits and damage if water enters