Liang Li De Chen
Mr. Chen: I am from Liangli. We have encountered a problem that the brightness measurement of the LED meets the requirements, but the value measured by the luminous flux is very low. That is to say, the LED looks very bright, but it is not bright enough to measure. What is the reason?
Yang Zhengming: First of all, we must define the definition of brightness and luminous flux. Because the illumination angle of the LED is small, it looks very bright, and the measured brightness is also high. But the so-called functional lighting is not its own bright, but to illuminate other things. For example, on a wall, or on my body, illuminating these things depends on their own luminous flux. It is necessary to have a lot of light energy, and there must be a lot of lumens. Light energy is not enough. The lumens are different in different places. It is necessary to have a lot of lumens on the object to light up. The number of lumens emitted by the LED is too small. In addition, bright and non-bright are related to many factors, not necessarily bright, and the luminous flux is high. For example, Chinese people tend to think that high color temperature is brighter. Europeans and Americans think that low color temperature is brighter, while color temperature is high, luminous flux is high, color temperature is low, and luminous flux is low.
Chen Dahua: First of all, we must understand the basic definition of the three physical quantities of brightness, illumination and luminous flux. The amount of road illumination we use now is actually not in line with the standard, and road lighting is about brightness. The second question, feeling bright and bright, is combined with physiological psychology in addition to the physics perspective. For example, we don't feel bright in this room. Not only is the light on the top good, but it also has to match our eyes. For example, foreigners are uncomfortable and we see it comfortable. Physiological psychology reflects differently. Foreigners like 2700, we like 6400, you look closely at the eyes, Europeans and Chinese eyes are not the same, carefully analyze the distribution of visual nerve cells inside, so the question you just mentioned, we will be in the world of science, Considering the combination of physiology and psychology, your question can be well answered.
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