Semiconductor lighting emphasizes system concept development standards become a top priority

To compete with existing light sources, LEDs need to meet the following requirements: A lamp requires more than 1000lm to be used for lighting. The luminous flux of 1000lm should be less than US$2, and the luminous efficiency per watt should be above 100lm. Exponent indoor lighting should be greater than 85, outdoor lighting should be greater than 70. Recently, Cree has developed a warm white, high color rendering LED with red and yellow phosphors, 1mm 2 chip, color temperature 2780K, color rendering index Ra = 92.8, luminous efficiency 113lm/W.

LED is a semiconductor device. The parameters of light, electricity and color vary with the device temperature and ambient temperature, and the heat dissipation and stability need to be improved. The LED light source does not have a defined optical axis and light distribution curve, and is not a strict point light source. The light intensity is inversely proportional to the square of the distance. The law does not apply. The optical parameters are different at different angles, that is to say different light levels have different light distributions. .

The lag in industry standards has seriously hampered the development of the industry. It is imperative to study and formulate standards as soon as possible. The IEC (International Electrotechnical Commission) is organizing research and development of standards for LED lighting products, and we should actively participate. The concept of the existing color temperature, the concept of color rendering and the color rendering index are not applicable to LEDs, and we are pushing the CIE (International Commission on Illumination) to study the revision of international standards.

LED is used for lighting just around the corner. We can't obey the old, follow the traditional concepts and blindly follow the old road collectively, and we should give full play to the optical characteristics of LED to create modern lighting products, break through the traditional concept and develop suitable for people's physiological and psychological needs. Safe and healthy lighting products promote the transformation of lighting theory and promote the development of the lighting industry.