Almost every outdoor sportsman will prepare a spotlight flashlight, especially in the evening, it will bring you a lot of convenience, but do you know what factors determine the flashlight spotlight?
1, reflective cup
Reflective cup, in the case of the same illuminant, the diameter and depth ratio of the reflector determines the concentrating effect of the flashlight, and the design of the reflective curve is a transformation. The diameter of the reflector, the deeper the depth, the more likely it is to design a more concentrated light. Therefore, the long-range effect is required, and the tip of the flashlight can be realized. The depth and diameter deviation of the compact flashlight reflector cannot be Achieve long-range! Unless a new lens (convex lens) mode is used.
The mirror-treated reflector (light cup) has higher reflection efficiency, the center spot is brighter, the flood area is low, and some halo effects appear. In contrast, the orange peel-treated reflector is evenly reflected by the light in the uneven reflector, and the center spot is not as prominent as the mirror reflector. The mirror between the micro-orange reflectors Between the orange peel and the orange peel, it is very effective to solve the excessive concentrating of the specular reflector and the excessive flooding of the orange peeling cup.
2, the illuminant
Illuminants, most of the current LED concentrating flashlights use various grades of LEDs from CREE, USA, and different LED package structures have different viewing angles and different concentrating effects. For example, the current CREE-Q5, XM-L T6 LED has high luminous efficiency, but the perspective angle is 125 degrees. It belongs to the floodlight type LED. Even if the mirror reflector is used, the effect of collecting light still has no small core LED mirror reflection. The cup is so good. If you want to try to achieve concentrating, you need to use a large reflector to adjust.
The core of CREE-Q5 is smaller than the core of XM-L T6, so the CREE-Q5 is better than the core of XM-L T6 under the same reflector condition, but the brightness is hard to reach the XM-L T6. . American CREE LED grade, small core XP-E is also the first choice for concentrated long-range flashlight, but because XP-E's luminous efficiency and Q5 and XM-L T6 have a big gap, so the total luminous flux is not compatible with Q5 It is beautiful with T6.
Most of the LED flashlights have circuit control, the same level of LED, the drive current is reduced, the brightness changes, that is, the luminous flux (lumen LM) is the smallest. The stronger the long-range ability of the luminous flux projection, the long-range is the reflective curve that needs the reflector.
4, the drive circuit
Drive circuit, the drive circuit can be roughly divided into direct drive and constant current drive.
The current of the direct drive circuit has no cumulative control. When the battery power is high enough, the battery will do its best to supply the LED. At the beginning, the flashlight will be bright, the temperature will rise in vain, and the heat and heat will not reach equilibrium. After the battery is gradually depleted, the brightness and temperature will gradually decrease. This kind of circuit is too high in the previous period, which is very harmful to the LED and the battery. The life of the lED often cannot reach the design life, and the battery will also be shortened due to the overloaded working life. This kind of "quick success" is not limited to the flow of the driver, only the low-end flashlight will see. The significance of the long-range shot is that the long-range effect in the early stage of the flashlight operation will be better, and the long-range capability will be rapidly attenuated by the advancement of time.
The constant current driving current belongs to the current mainstream driving scheme. The current control of the circuit is fed into the LED, so that the current is always maintained at the same size. After the current is constant, the heat and heat dissipation of the flashlight are also balanced, and the output current of the battery can be maintained. This is the optimal driving solution, and a small volume of flashlight can be balanced in about 15 minutes. The long-range effect stays the same.
5, color temperature
Color temperature, the current LED is roughly divided into cool white, medium white (positive white), warm white three color temperature. The cool white light has the highest color temperature and poor color rendering, which is rare in the flashlight industry. Zhongbai (Zhengbai) has good color rendering and outstanding brightness, and is widely used. Warm white has the lowest color temperature and better color rendering than medium white (positive white). The better the color rendering of the LED in the long-range flashlight, the more the principle can be the same as the car's light in the rain, fog and dust environment. The headlights of the car are basically useless to the foggy environment, and the pale yellow fog light can be better. Penetrate the fog.