Powerful Flashlight Buy should pay attention
Powerful flashlight precautions
1. the number of moderate. The general use of the household should not be more than 12, the use of the battery in the 2 to 3 as well, and then a little waste, for other special needs can be determined according to their needs.
2. Welding is tight. Each diode is connected by welding on the circuit board, if there is poor contact with the Weld, it may cause the ball does not shine or affect the overall use.
3. Earthen polished surface as much as possible. This flashlight is not like ordinary flashlight can adjust the focal length, the purchase should be careful not to astigmatism.
4. Power switch contact to be obvious. This type of flashlight using rotary switch, tighten the open, and then loose on the off, if the contact is not obvious, it is easy to cause when the phenomenon of off when the light.
5. Attention to waterproof. Because it belongs to the electronic products, flashlight front has a circuit board, once the water prone to short circuit, causing damage.
Direct drive circuit current is not controlled, when the battery power is high enough time, the battery will do everything to provide the required LED, the flashlight will be very bright, the temperature rises in vain, heat and heat can not be balanced. To the battery gradually depleted after the brightness and temperature will slowly decline, this circuit due to pre-power is too high, the LED and battery damage is very large, lED life is often unable to achieve the design life, the battery will be overloaded working life shorten. This "quick success" of the flow of the drive program, only low-end flashlight will see. In terms of long-range significance, in the early work of the flashlight effect will be better, with the advance of time, long-range ability will be rapidly weakened.
Constant current drive current, is the current mainstream drive program. The circuit will control the current supplied to the LED, so that the current is always maintained at the same size, for example: XM-L T6 with 2.0A constant current drive, the brightness is always maintained at 700 lumens. After the current constant current, flashlight and heat dissipation is also balanced, the battery output current can also be maintained. This is the optimal driver solution. General small volume of flashlight can be balanced for about 15 minutes. Long-range effect can be maintained consistently.
Color temperature, the current LED is roughly divided into cool white, white (white), warm white three color temperature. Cool white color temperature is highest, color is not good, in the flashlight industry is rare. In the white (white) color is good, prominent brightness, is widely used. Warm white color temperature is the lowest, color is better than the white (white). In the long-range shoots the better the color of the LED, in the rain and fog, dust environment, the more able to reflect the penetration, low color temperature LED in the ultra-long distance still can see the object. Principle with the car lights, car headlamps on the fog environment is basically useless, and light yellow fog light can better penetrate fog.