Do you know the light color of outdoor flashlights ? People who are often outdoors will prepare a flashlight or portable headlamp . Although it is very inconspicuous, as night falls, this kind of thing can really take on important tasks. However, flashlights also have many different evaluation criteria and usages. In this regard, people may not pay too much attention. Next, from the perspective of the color of the light of the flashlight, I will share with you the application of flashlights of different colors in the outdoors. It may not be useful, but it is also right to expand the field of vision in case of emergency!
white light
First talk about the most popular white light. The popularity of white light began with the widespread application of white LEDs in flashlights in recent years. White light is close to sunlight, and white light in the dark is in line with the visual experience of our eyes, so it does not take time for the eyes to adapt, and it should be the most comfortable color light for the eyes. Moreover, white light is higher than other color lights in terms of brightness and color temperature, giving people the strongest bright feeling. Therefore, in outdoor activities, white light is widely used in night hiking and camp lighting.
yellow light
The yellow light mentioned here is not the yellow light emitted by traditional flashlights using incandescent bulbs. Strictly speaking, the light emitted by incandescent bulbs is also a kind of white light, but it is warm yellow due to the low color temperature. White light is a mixture of red, orange, yellow, green, blue, ingot, and purple. It is a mixed color. The yellow light here is a single color yellow without mixing. Light is essentially an electromagnetic wave of a certain wavelength. When the electromagnetic wave propagates in the air, it has five forms: direct radiation, reflection, transmission, refraction, and scattering. Due to its specific wavelength, yellow light is the least refracted and scattered of all visible light. That is to say, yellow light has the strongest penetrability, and under the same conditions, yellow light travels farther than other visible light. It is not difficult to explain why traffic lights use yellow light and car fog lights use yellow light? The outdoor environment at night is usually accompanied by water vapor and mist. In such an environment, a yellow light flashlight is perfect .
red light
Red light is also a color light used more by outdoor experts, especially in European and American countries. Hunting sports are popular in many European and American countries, and red light flashlights are popular among European and American hunting enthusiasts. The human retina contains two photosensitive tissues: cone cells and rod cells. Cone cells distinguish colors, and rod cells distinguish contours. The reason why people can produce the perception of color is because of the cone cells in the retina. Many animals have only rods or few cones, resulting in insensitivity to color or even no color vision. Many of the prey under the rifles of European and American hunters are this kind of animal, which is particularly insensitive to red light. When hunting at night, they can unscrupulously use red light flashlights to sweep away the prey without anyone noticing it, greatly improving the hunting efficiency. .
Domestic outdoor enthusiasts rarely have hunting experience, but red light is still a very useful light color for outdoor activities. The eyes are adaptable – when the color of the lighting changes, the eyes need a process of adaptation and adjustment to adapt. There are two kinds of adaptation: dark adaptation and light adaptation. Dark adaptation is a process from light to dark, which takes a long time; light adaptation is a process from dark to light, which takes a short time. When we use a white light flashlight for outdoor activities, when the line of sight changes from a bright place to a dark place, it belongs to dark adaptation, which takes a long time and will cause short-term “blindness”, while red light takes a shorter time to dark adapt, It avoids the problem of short-term “blindness”, allowing us to treat our eyes better and maintain better night vision when we are active at night.
blue light
Most of the white light LEDs actually produce white light by irradiating phosphor powder with blue light LEDs, so the white light of LEDs contains more blue light components. Due to the high refraction and scattering rate of blue light when it passes through the air, it usually travels not far, that is, the penetration is poor, which can also explain why the penetration of LED white light is weak. Still, Blu-ray has its special knack. Animal blood stains glow faintly under blue light. Taking advantage of this characteristic of blue light, European and American hunting enthusiasts use blue light flashlights to track the blood of injured prey, so as to finally collect the prey.
Post time: Feb-01-2023