General lighting requires lamps with high luminous efficiency, long life and environmental protection. The main difference lies in the lighting effect and quality of indoor lighting sources (including color rendering, chromaticity consistency, light source output and uniformity, human eye comfort). Sex, etc.) have higher requirements, and the consumer groups they face are more sensitive to the price of lamps. On the other hand, the advantages of the luminous efficiency of the blue chip need to be further improved and limited by the packaging technology of the white LED. Most of the current semiconductor lighting fixtures are high color temperature and cool white light, and the consistency of the color product is not as good as that of the conventional lighting. The intention is that semiconductor lighting fixtures are currently in large-scale applications in outdoor lighting, and have just begun to take off in indoor lighting. Therefore, limited by cost and lighting quality, semiconductor lighting will be the first to be applied in large-scale outdoor lighting, and then gradually enter the field of indoor lighting with the continuous development of technology.
A typical application of outdoor lighting is street lighting, which is an important part of urban lighting, and its power consumption accounts for a large part of the total lighting power. The traditional street lamp adopts high-pressure sodium lamp, and the high luminous efficiency of high-pressure sodium lamp has a low color rendering index, which makes the color distortion of the irradiated object very obvious; the color rendering of high color rendering high-pressure sodium lamp is improved, but its luminous efficiency and life span are all Loss; limited by its short life, it is necessary to carry out expensive high-altitude maintenance operations frequently. Generally, the high-pressure sodium lamp has poor light distribution performance, that is to say, the uniformity of road illumination is not good enough, and in order to meet the uniformity requirements of road illumination, the high-pressure sodium lamp street lamp generally adopts a rated power much larger than the illumination requirement under the lamp post. As a result, energy is wasted. Therefore, the development of new high-efficiency, energy-saving, long-life, good color rendering index and environmentally friendly street lamps is of great significance for urban lighting energy conservation. The huge market demand in the field of outdoor lighting has promoted the continuous improvement of the technical level of lamps such as power LED street lamps, the cost has been declining, and new products have emerged.
The most commonly used products for indoor lighting are incandescent and fluorescent lamps. Incandescent lamps have extremely low luminous efficiency, only a few lumens per watt, while fluorescent lamps contain harmful substances such as mercury, which is not conducive to environmental protection. Therefore, indoor lighting has a stronger demand for efficient and environmentally friendly lighting products. Although the current white LED devices have surpassed incandescent lamps and fluorescent lamps in terms of luminous efficiency and environmental protection, the lighting effects and quality of the lamps formed by them have not rapidly formed the advantages of traditional illumination sources, and their applications in indoor lighting. just began.
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