As a light source with great development potential, LED 's long life, firm structure, low power consumption and flexible form factor have attracted more and more attention. In recent years, LEDs are especially monochrome. LEDs are widely used in large screens, signal lights, and landscape lighting. With the continuous development of LED technology , the light-efficiency, color rendering, color temperature, power of single LED and luminous flux of LED module of white LED have made new breakthroughs. People are full of expectations for LED application in lighting.
However, the application of white LEDs to ordinary indoor lighting is also facing a series of challenges. For example, the luminous flux of a single LED is difficult to meet the needs of general lighting, the unit cost is too high, the luminous efficiency is lower than that of the energy saving lamp, the color difference is large, and the stability is stable. Insufficient. Although the research results are gratifying, it still takes a certain amount of time to produce market-oriented products that truly meet the lighting requirements. This is a fact that LED R&D personnel, manufacturers and users cannot avoid. Based on the ergonomics of lighting, this paper analyzes the current development status of white LEDs and the differences between the normal indicators required for healthy light environments, and puts forward some suggestions for promoting the application process of LEDs in indoor lighting.
1. Human ergonomics of lighting
Human ergonomics is also called human ergonomics or ergonomics. Taking the "human-machine-environment" system as the research object, using the methods of measurement, statistics and analysis to study the three elements in the "human-machine-environment" system. The relationship to solve the human efficiency and health problems in the system. That is to say, the study of human ergonomics is devoted to the design and evaluation of human needs, human capabilities, human limits, and how to coordinate with tasks, work, products, environments and systems. The ergonomics of lighting is to study how the design of the light environment meets people's needs, enabling people to complete visual operations faster or better, or to meet the needs of comfort and health.
The lighting environment should fully consider the needs of people's visual functions, so that people can work normally in a suitable visual environment, that is, they can see clearly; and they must satisfy people's psychological needs, that is, they must be comfortable. A recent study showed that light can also affect the body's circadian rhythm and health by affecting the secretion of melatonin in the human body. Therefore, considering the good light environment of human ergonomics should start from the visual, psychological and physiological needs of human beings, and comprehensively consider a number of factors, otherwise it will have adverse effects on people's work efficiency, mental or physical health.
2, the development status of white LED
2.1 Light effect
Since the birth of the LED in the 1960s, LEDs have grown at a speed of 30 times the brightness per 10 years and a 10 times lower price than the “Hays Lawâ€. According to reports, the laboratory data of white LED light efficiency has exceeded 100lm/W, and the high-power white LEDs entering the commercial field have reached 40lm/W. With the breakthrough of key technologies, the light efficiency of high-power LEDs in the future still has a large room for improvement, and the highest possible is 150-200 lm/W.
2.2 Luminous flux
With the advent of high-power LEDs and breakthroughs in key technologies such as packaging and heat dissipation, the commercialization of 5W LEDs has begun to take shape, which has greatly improved the luminous flux of LED modules. The latest research data from Nichia Corporation shows that high-power LED integrated modules with powers of 5.5W and 11W and 250 lm and 400 lm, respectively, have been successfully developed. This has made the LED's use in general lighting a big step forward.
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