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Under such a basic framework, I think that tactical flashlight should look at several aspects:
reliability
As with military equipment, the first thing to look for in tactical flashlights is reliability (including batteries). The reliability depends on waterproof, surface oxidation, material, and structure. Waterproof and falling standard flashlights that meet the ANSI/PLATO FL1 standard are generally no problem.
switch
Look at the switch is simple or not, if it is multi-position then also pay attention to switching operations and circuit logic. Why do you want the tail cover, because it touches one standard. Why do you want to single, because you don't want to think. Why is it fast, because martial arts in the world is not fast and not broken.
brightness
Followed by brightness. First of all, the concept of brightness is not suitable for measuring with lumens, but should look at the intensity of light received on the illuminated object. Light scattered outside the edge spots is meaningless in this light. Most people may not know that only 80 lm is needed for the human eye. Many times we don't seem to have a flashlight because it's not the flashlight itself that has problems, but the environment in which the environment is used is complicated.
So for the brightness that many people care about (actually luminous flux), my views are more radical:
1, gun light should not exceed 300lm. Far from playing a role, it was close to myself. 200lm gun light is enough.
2, handheld tactical barrel should not exceed 500lm. Hand-held tube does not consider mid-range projection, but it needs to consider light control.
3, on-duty flashlights should have at least two levels of high and low, the logic has been low in front, highlighted in the latter. The highlight tactical brightness should not exceed 900lm. Why do I think that because the police are inevitably confronted with high-light dogs and do not match, high-brightness lights can offset some of the incoming light and penetrate the windshield of law enforcement objects, and still can see each other and create a deterrent effect.
4, Peak brightness only makes sense when lit. The test of true life is the constant current circuit.
5, canislatrans's tactical cruising time makes sense, because the brightness output can only be used to find the keyhole when it can not get out of the task.
Light quality
Light quality is most easily overlooked, but it is about life and death. The quality of light mainly depends on spot, color, and color temperature. Spot, some people like to flood, but more people still choose to highlight the center spot. Auxiliary shooting is a consideration.
In general, we want to see two intact concentric circles like other flashlights. We cannot have dark spots or flickering halos. The outer edge of the edge spot is inevitably divergence and therefore has little relation to it. Color rendering and color rendering are very important for target recognition. On the occasion of the first instance, if the misinterpretation of the fire is caused by the misrepresentation of the object or the color, shape or texture of the human body, the consequences are very serious.
The color temperature, the dazzling high color temperature looks very bright and there is no help. The color temperature is too low for the eyes and it is difficult to accept, and can not see the color. In fact, sunlight is the best benchmark, 5500K which is the most suitable color temperature for our eyes. Of course 5000K is also acceptable.
power supply
At present, the most commonly accepted high-performance power source is a lithium battery. No matter CR123A, 18650 or lithium polymer battery, it is already in the mainstream.