How to judge whether the constant current chip Led flashlight?
Without the constant current drive board, the whole discharge brightness of the battery is gradually decreasing
The simplest method is whether the brightness changes during the first half of the observation battery discharge, constant current chip of the first half is the same brightness, such as 7135, dark in the relatively low battery voltage later. If it is the whole constant current design, only when the battery is about to be finished, the brightness will decrease rapidly.
