Abstract
The production and the life of the human has a closed relationship with the light, the growth of plants need light, the visual of the people have to rely on the light, almost all of the human activities are indispensable for the light. The light is almost the source of the energy on the earth, along with the increasingly depleted traditional energy sources, the exploration and the use of light energy is more and more attention, so the spread forms and the energy-absorption method of light energy is more and more attention. The human want to use of the light, we must understand the nature of light firstly, and this paper is that for this purpose, firstly, through the centuries’ research on awareness of our ancestors to deepen our understanding of the light. Secondly, we can enquiry the literature to explain some of the basic terms of optical. Furthermore, by understanding of the spread ways of the light energy, we can know and understand the forms of the use of methods of the light. Finally, we can through the examples of the use of solar energy to deepen the understanding of the light.
Keywords:Light Energy transmission Radiation flux Light flux Candela Dollies LED efficiency