The so-called "light health", firstly, lighting must meet the functional requirements of the place, which consumers often say is not bright or beautiful; secondly, lighting must meet people's psychological requirements, such as the effect of color temperature and brightness on people’s mood, whether light and shadow harmonious. Unreasonable lighting tools and inappropriate lighting methods can have a great impact on health. Bright light can change the brain's internal clock and control sleep. Working under light for a long time will reduce the body's absorption of calcium. Strong light waves also increase the number of abnormal cells and cause normal cell death.

People's requirements for lighting mainly have three aspects: 1. Functional requirements, that is, to meet the most basic lighting requirements. Decoration requirements, aesthetic requirements. Physical and mental health requirements, physical and mental health requirements, first need to balance the spectrum, because the human health standard is based on the sunlight environment, so the closer to the solar spectrum value, the healthier; for example, different light colors will affect the seven major systems of the human body. By adjusting the ratio of light chromatogram, we can design healthy light products suitable for different people and spaces. First, the lighting must first meet the health standards, and secondly, the functional requirements of the place of use, including decoration requirements, and psychological needs;

From the perspective of functional requirements, if the light quality is poor, it is easy to make people tired. For example, the light emitted by the fluorescent lamp of the magnetic ballast produces 100 light and shadow changes per second. Working in such a light environment for a long time, people’s eyes are prone to fatigue and nearsightedness, which is also not conducive to lighting and photography of moving objects. In addition, if the computer is used under light, the stroboscopic flicker of the fluorescent lamp and the frame flicker of the fluorescent screen usually overlap, forming optical resonance, which is more harmful to the human visual system. Because of this, as early as 1997, the European Electrotechnical Commission banned the installation of fluorescent lamps with induction ballasts in offices equipped with computer screens to protect the health of computer operators. At the same time, indoor lighting must avoid or reduce glare interference. If the brightness of the lamp is much higher than the general indoor environment, people will feel glare. Glare can cause discomfort and severely damage the visual function. Therefore, indoor lighting must avoid or reduce glare interference, so that "soft" light can enter people's sight.

Secondly, whether the illuminance value meets the requirements of national standards. Generally speaking, reading and writing in the dark tends to have a bad effect on the eyes. When people cannot see clearly or write clearly because the light is too dark, people will instinctively approach the target in order to see clearly. After a long time, the refractive system of the eye will change, leading to myopia.

But the brighter the light, the better. If the brightness of lights, lamps, windows or other areas is much higher than the brightness of a general indoor environment, people will feel glare. Glare can cause discomfort and severely damage the visual function. Therefore, indoor lighting must avoid or reduce glare interference, so that "soft" light can enter people's sight.