Because the pursuit of LED lighting is not entirely in the technology itself, the function of the lighting itself is not completely necessary to illuminate. Of course, the innovation includes the integration breakthrough in the electromechanical thermal technology, and also the consumer in the visual, The value of the senses such as touch. LEDs are used in a wide range of applications, and we are now discussing the issues related to the innovative design of lighting applications and the direction of development. LED performance requirements vary for different lighting applications In order to expand the market acceptance of LED light source, it is necessary to meet the functional requirements. Not every LED illumination source must pursue the highest luminous efficiency, the lowest price, the highest color rendering, the longest life, etc., but depending on the application. There are differences. Now I will talk about the general office work lighting, reading lighting and future household light bulb replacement lighting market in indoor lighting . The primary pursuit for LED light sources is to achieve the best price/performance ratio, with the highest lumen output, minimum power consumption and lowest price in case of safety guarantee. Because for the consumer, compared to other traditional light sources, spending the least money to buy the most economical products is one of the main driving forces. The added value of marketing such as UV-free, mercury-free, high color rendering, and 50,000-hour life is not the main reason for expanding market acceptance. Of course, the brand represents a certain degree of quality trust, and visual senses will also have an impact on color preferences. Therefore, how to innovate and design LED light sources suitable for market demand will be a topic to be discussed. The luminous efficiency of LED light sources has been developed so far, and has surpassed most of the traditional light sources (Figures 1, 2). The efficiency of a small number of low-voltage or high-voltage discharge light sources can be higher, but on the power supply control and drive, volume and temperature. Each has its own advantages and disadvantages, the following will explain each step of the LED lighting system design.
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Figure 1 Evolution of LED luminous efficiency from 1995 to 2020
Figure 2 LED lighting niche market 
