2022-11-08
What is the meaning of the color temperature of the light? Simply put, it is a measurement that indicates the color component contained in the light alone, some people think that the preference in color temperature is dependent on the person, which is related to the scenery view we see every day, the general choice of lamps and lanterns is required to look at the light, so how much led lamp color temperature is appropriate?
What is the meaning of the color temperature of the lamp?
Color temperature is a unit of measurement that indicates the color component contained in the light. Theoretically, the color temperature refers to the absolute black body from the absolute zero degree (a 273 ℃) after the heating of the color presented. Black body in the heat. Gradually from black to red, turn yellow, white, and finally emit blue light. When heated to a certain temperature. The spectral composition of the light emitted by the black body. It is called the temperature of the color temperature, the unit of measurement is "K" (Kelvin), if a light source emits light, and a certain temperature of the light emitted by the black body contains the same spectral composition. That is called a K color temperature, such as the color of light from a 100 W bulb, and the absolute black body at 2527K color, then the color temperature of the light from this bulb is: 2527K + 273K = 2800K
Color temperature is a measure of temperature, usually used in the field of physics and astronomy, the concept is based on a fictitious black object, when heated to different temperatures will emit different colors of light, the object appears as different colors. Just like when heating a block of iron, the iron first turns red, then yellow, and finally will turn white.
The color temperature calibrated using this method is the opposite of what the general public considers "warm" and "cold", for example, people usually feel that red, orange and yellow are warmer, and white is warmer. Orange and yellow are warmer, white and blue are cooler, but in fact the color temperature of red is the lowest, and then gradually increase is orange, yellow, white and blue, blue is the highest color temperature. When using natural light for shooting, because the color temperature of light at different times is not the same, so the color of the photos taken is not the same. For example, when shooting under a clear blue sky, the color temperature of the light is higher, so the photo is cooler, while if you shoot at dusk, the color temperature of the light is lower, so the photo is warmer. When shooting with artificial light, there will also be different types of light sources, resulting in photos with different tones.
Knowing the relationship between light and color temperature helps photographers shoot in different light conditions, calculate in advance what tones will be captured, and further consider whether to intensify or diminish such tones, and which camera function should be used to intensify or diminish such tones during actual shooting.
The color temperature of the light source is different and brings different feelings. High color temperature light source illumination. If the brightness is not high will give people a cold feeling; low color temperature light source, the brightness is too high will give people a hot feeling. The lower the color temperature, the warmer the tone (reddish); the higher the color temperature, the colder the tone (blue).
Color temperature (colo(u)r temperature) is a characteristic of visible light with important applications in photography, video, publishing, and other fields. The color temperature of a light source is determined by comparing its color with the theoretical thermal blackbody radiator. The Kelvin temperature at which the thermal blackbody emitter matches the color of the light source is the color temperature of that source, and it is directly related to Planck's blackbody radiation law.
What is the appropriate color temperature of led lights?
The most appropriate LED lighting color temperature range, should be close to the sun's natural white light color temperature range is the most scientific choice; lower irradiation intensity of natural white light, you can achieve other non-natural white light incomparable irradiation effect; the most economical road brightness range should be within 2cd/m2; improve the total uniformity of lighting and eliminate glare is the most effective way to save energy and reduce consumption.
In the incandescent, high-pressure sodium lamp years, people have no choice of color temperature of lighting fixtures, but to silently accept and adapt. However, into the era of LED lighting fixtures can choose the color temperature, choose what kind of LED lighting fixtures color temperature, it has become an urgent need for it to have a clear and sober view of the problem. This is a matter of energy saving and lighting quality, we can not be sloppy response.
1, the human brain on the recognition of things and response mechanism
The human brain through the eyes to get the first reaction to the image of external things, is to get the image and the original stored in the brain memory image information compared to identify, and then immediately make the corresponding response action. If the acquired image information is closer to the original stored information, the faster the recognition speed, the more agile the response. If the driver is under the low color temperature light at night which is far from the natural light of day, the more effort the recognition of the acquired image is, the slower the recognition speed is, and the slower the response speed follows. The result of a 0.1 second slowdown in response speed is enough to make the accident rate soar. To compensate for the shortcomings of this day and night color temperature difference lighting, the only way is to increase the intensity of lighting to improve the recognition speed in low color temperature, which means increasing energy consumption.
From the evolution of animals to humans hundreds of thousands of years long process, humans have been living under the natural light of the sun, for all production and social activities. The result of long natural selection and evolution makes the human eye most adaptable to the color temperature range is the sun's natural white light color temperature range (5500-7500K). In this color temperature range, human eyes have the strongest ability to recognize moving and static objects; in this color temperature range, human beings have the most responsive ability to external things. Because, people's brain memory information stored inside the object image information, most of them are formed under the natural white light irradiation. Therefore, the most appropriate LED lighting color temperature range, should be close to the sun's natural white light color temperature range, is the most scientific choice.
2, Europeans like low color temperature of biological, geographical reasons
So why do Europeans prefer low color temperature? This is its ethnic and geographical reasons. Europeans are white-skinned race, white light will make white-skinned people look pale. There is even an exaggeration, like the color of the dead, so it is natural that they prefer warm tones. But we are yellow, ah, the sun's natural white light tones do not make us look pale. Also, most of Europe is located in the high latitude, low temperature zone, which is also contributed to their preference for warm tones of geographic reasons. However, we are located in a temperate zone with four distinct seasons, and no long cold winters, following the Europeans choose too warm tones, it is a little too much.
3, yellow light rain fog penetration ability of the appropriate application occasions
There is another way of saying that the low color temperature yellow light penetrates rain and fog better, so you should choose it. We do not deny the fact that yellow light on the rain and fog penetration ability is better than white light. However, we should understand that a large number of road lights, is working under the conditions of sunny days accounted for the majority of the time, rain and fog weather, after all, accounted for a relatively small proportion. Choose to adapt to the rain and fog weather warm color temperature lamps and lanterns, is not the noise of the main, the cart before the horse? In specific occasions, such as foggy port occasions, is the reasonable approach to choose low color temperature lighting fixtures. Ordinary road lighting fixtures, or should choose close to the sun's natural white light color temperature range, is both scientific and energy-saving practices.
Above, we only from the human brain's recognition and response mechanism to explain the lighting color temperature should be close to the natural white light reasons. Here, we will further analyze this argument from the perspective of color rendering index.
4, the advantages of high color rendering index of natural white light
The sun's natural white light, through the refraction of the Mitsubishi mirror, can be broken down into red, orange, yellow, green, green, blue, purple and other continuous spectrum, wavelength 380nm-760nm of seven kinds of light. The sun's natural white light contains a complete and continuous visible spectrum.
The human eye can see objects because of the light emitted or reflected from the object, into our eyes and perception. The basic mechanism of lighting is to shine light on the object, through the absorption and reflection of the object, and then reflected from the external surface of the object into the human eye, so that people perceive the color and appearance of the object. However, if the light beam is only a single color of light, then we can only see the object with that color. It goes without saying that if the beam of light is with a complete continuum of light
5, low color temperature of the low color rendering index cost
Sunlight from morning to night on Earth, not every moment we feel the sunlight, are bound to be natural white light. Because it is also subject to varying thickness of the clouds absorption and refraction, reflection of interference, the composition and proportion of the various spectral lines that constitute natural white light, will change. The sunlight in the morning and evening, more by the heavy clouds, the angle of exposure and refraction of the serious impact, so the golden sunlight at this time, its color rendering index has been far from 100, it can not be considered natural white light.
According to Kevlin's definition of color temperature, 2800K-10000K belong to the color temperature range of sunlight, which is the broad definition of the color temperature range of sunlight. However, only the color temperature of 6500K light (also known as D65) is set as the standard color temperature of white light, it is also the CIE standard lighting body D65. 6500K color temperature of the light contains the most complete spectrum, the closest to the natural white light. The further away from the natural white light color temperature of the light source, the lower its color rendering index.
Obviously, the lower the color temperature of the LED, its color rendering index will be lower than the white LED. In the low color rendering index of the light, to see the true nature of the object, you need a higher light illumination to compensate for the lack of color rendering index. This means that people have to increase the light source energy input, in order to get close to the natural white light under the real appearance of the object displayed.
Practice has proven that the use of light sources close to natural white light, only need far less illumination than other light sources, can allow people to truly perceive the true color and original appearance of objects. Low illumination means low energy input, which means energy saving. Therefore, we recommend using a light source close to natural white light as our lighting source.
Due to the LED packaging technology, the red and yellow pigment LEDs, the light decay faster than the white LEDs, that is, its luminous intensity is bound to decline faster than the white LEDs. The price to compensate for this loss of light intensity decline, is to increase the number of LED assembly lamps, which means that the cost and energy increase, which is also very helpless results.
6, low color temperature LED light intensity decline cost
Due to the reasons of LED packaging technology, mixed with the red and yellow pigment LED, its light decay faster than the white LED, that is, its luminous intensity is bound to decline faster than the white LED. To compensate for this loss of light intensity decline in the cost, is to increase the number of lamps and lanterns LED assembly, which means that the cost and energy increase, which is also very helpless results.
7, modify the lighting standards of the times inevitable
The ultimate purpose of lighting is to allow people to obtain the true image of moving and static objects to observe the clarity. Now there are color rendering index of 70-90, close to the natural white light of the sun, the emergence of LED lamps and lanterns, is a good opportunity for us to improve the quality of lighting and reduce energy consumption.
The color rendering index of high-pressure sodium lamp is only 20-30. in the era of its dominant street lighting system, in order to achieve the discernment and clarity of observation of objects under its light, it can only use the method of increasing the value of illumination to try to achieve the purpose. The Ministry of Construction's "Design Standards for Urban Road Lighting" is based on the low color rendering index of sodium lamps as the dominant lighting source in the context of the development of these standards were originally unjustifiable. However, to the high color rendering index of LED as the lighting source conditions, this standard is too high. Because, in the high color rendering index of the LED light source, to obtain the true image of the object recognition and observation of the clarity, only far less than the standard of illumination requirements for high-pressure sodium lamps. According to our years of practical experience, only need less than the Ministry of Construction "urban road lighting design standards" 30% of the illumination intensity, you can achieve the same with high-pressure sodium lamp, or even better recognition and clarity of the lighting effect.
Using the same illumination standards as high-pressure sodium lamps to regulate LED light sources, it means a needless waste of energy. High-intensity LED lighting, and even LED light will be too "blinding" complaints; reduce the intensity of exposure, not only to obtain energy savings, but also to obtain a "soft" lighting environment.
For high-pressure sodium lamps and LED lamps and lanterns, the two color rendering index difference of 2-3 times the lamps and lanterns, illumination standards are sure to be the inevitable end of the revision. In our country has not yet implemented changes to the road lighting standards, the only way to bring this issue to the attention of the implementation of experts. Without offending the existing national lighting standards, it is advisable to use the standard's low-grade value for wise.
Therefore, LED lighting fixtures color temperature range and the choice of lighting standards, and lighting quality and energy conservation and consumption is closely related. Choose close to the sun's natural white light color temperature of LED lighting fixtures and appropriate lighting standards, is wise and scientific, in line with the principle of energy saving choice.
The above is the color temperature of the light is what it means and how much the color temperature of led lights is suitable for the introduction, the content is only for your reference, I hope it can help you.
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