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LED flashlight based on different basic principles are divided into three categories:

1. The most widely used one, is the traditional light bulb flashlight.

Flashlight bulb with a tungsten light resistance ohmic heating, the performance of this key bright led flashlights bulb technology is generally more formal quality tactical flashlights, light bulbs are also applied two methods, both xenon and sufficient iodine sufficient, very well made, lamp life can guarantee 30 hours in 5 or switch thousands of times, but very discrete lamp life, this value is just about the value of the actual use of the lamp is difficult to say which particular those living longer can only say that the products made by regular manufacturers unstable life of the probability is very low, and small factories out is unlikely to guarantee a stable life, and we usually use ordinary flashlight when you can feel good bulb high brightness, long life, low-quality bulbs rather poor, Gesanchawu to burned.Luminous efficiency of light bulbs about 10 to 15 lm / W (provided that the quality of passing lamp, poor quality, less efficient light bulbs), most of the energy is wasted as heat. Select bulbs tactical flashlight, the general requirements of over 60 lumens brightness flashlight, lamp power of more than 6W.

2. Limelight recently a very fresh, is to use high-power 200 led flashlight emitting diode (LED) instead of a flashlight bulb.

LED's greatest feature is the long life at rated power range, Thousands of hours of life can almost do not have to consider replacing the light bulb issue, perhaps with a rotten body flashlight, LED also not bad, really bad!

LED luminous efficiency higher than flashlight bulbs, up to 20 lumens / watt. Moreover, LED LED determines the structure of a natural earthquake, do not have to be used in firearms on the algorithm of fault as the light bulb filament, like fear. White LED light-emitting principle I do not know, anyway, as if issued by a certain wavelength of the semiconductor power monochromatic light to stimulate phosphor to issue white colors mixed together.

LED and resistor, it does not obey the U / I of the linear voltage / current relationship, small changes of voltage and current have a relatively big change, a corresponding change in luminous intensity, and LED current is too large, then severe fever, sharp drop in life, so most of the LED flashlight has a driver circuit to provide constant current output, to provide constant voltage output of a few to ensure the stability of LED light, LED flashlight, but some of the greatest possible to simplify the structure, improve reliability, directly in series with a resistor to limit current, the effect is tolerable, but also can provide the stability of longer light time.

High luminous efficiency, light, and power, long life LED development, design, production more difficult, only LUMILEDS COMPANY the luxeon star LED used widely, so few good LED flashlight China appears.

Common domestic products, are more common light-emitting low-power LED flashlight, light color, severe bluish, power is very small, very poor condenser performance, which can only be the usual toys, with the gap between tactical flashlight far!

But there are also direct use of home-made luxeon star LED flashlight, flashlight forum is very hot, "Shan Wa" (3 watts) LED flashlight is one such, but the work is relatively poor, with a length so short of my standards, I think it is not as tactical flashlights.

3. The most cutting-edge technology is hid flashlight (High Intensity Discharge, as if high-pressure gas discharge light technology) a flashlight.

At present, only a few products come out, basically the search with the relatively large volume of lamps, no small flashlight, and the price is super expensive. In addition to the common home of fluorescent tubes, HID is most common in the camera's flash, a small tube filled with gas, using high-voltage capacitor accumulates the gas discharge breakdown moment, given the dazzling white light, like lightning, and HID flashlight is a special Dianlu is continuing to provide a stable high voltage, so that gas continued to send a strong light. This flashlight is characterized by high luminescence efficiency can reach 50 lm / W or more, and higher color temperature, color rendering Ye Hao, which is commonly used in the camera as an aid to HID lighting are also able to verify it.

Wolf-Eyes domestic brands have been 40W3400 lumens of HID products available (is simply a small sun ah!), 10W500 lumen but also out of the lab, and abroad come some HID flashlight, but ... ... HID price ... ... Wolf 40W-Eyes is that ............ 1700 dollars! HID flashlight now I do not know more details and advantages and disadvantages, so I in 500 million when winning back maybe I would buy a specific test.