There are two types of innovation, demand-driven and technology-driven. Where will LEDS push lighting as the latest light source technology?
A light source is the source of illumination. For a long time, human's application of light source was mainly reflected in natural light, which gave birth to many great architectural cultures, which were not discussed. As far as artificial light source is concerned, it has gone through three major stages of light - fire homology, light - temperature homology (blackbody), and then photon theory. At the same stage of light fire, the main task of lighting is how to make the fire more prosperous. Ancient people innovated by looking for pine branches that could burn more easily instead of ordinary wood. After discovering the theory of oxidation, innovation mainly lies in better mixing oxygen into combustible materials. With the further development of understanding, light and fire separated, familiar Edison, experimental high-temperature materials to improve the life of the light source, is the historical mission of that generation of lighting people. A generation of theory a generation of technology a generation of products, under the background of photon theory, gave birth to fluorescent lamp, metal halide lamp and great LED, why is it great? Because this is the first time that humans have indirectly captured light without using high temperatures, the first time that electrons have been converted to photons without an intermediate state. The benefits are obvious. The reduction of the middle level means high efficiency. Today's LED, the efficiency of 160lm/w is no longer a high technology, and in terms of its theoretical limit of 355lm/ w (external quantum efficiency of 100%), it is both emerging and still a long way off. Bypassing the high temperature, the service life of the light source is significantly improved. Fluorescent lamps need to be changed to the maximum brightness slowly, metal halide lamps need to start up time, both because it takes time to rise in temperature, while LED is lit in milliseconds. With the decrease of temperature and device, the volume of LED becomes smaller obviously.

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