The basic principle of LED flashlight, flashlight, battery: by the luminous body, circuit, shell, reflecting cup, circuit warehouse, switches and other components, the basic principle is the current from the battery, then arrived at the circuit, with the circuit to adjust the voltage and current, and then output to the light emitting body, lighting lighting.
Flashlight with luminous body: LED, halogen lamp, xenon lamp (ordinary light bulbs and a tungsten xenon and only xenon HID), other electric luminous body is not common in this is not to say. As far as I'm here that luminance unit each LED unified with lumen (Lumens) mark, the luminous flux is usually said.
LED: recently the most popular is the LED, Chinese full name is "led", small power LED are generally long used in 1AA or 3AA, the power is too small, the household can also, but outdoor more than the poor, large power above about outdoor use 3W, is currently the main representative the most popular is USA CREE LED, long service life, reliable service life can reach 50000 hours.
Basic commonly used color from 5000-10000K, according to the K value of WD, WC, WJ, WB, WA, generally speaking is the yellow color temperature lower, the higher the white.