LED road lighting: safety and comfort is the first demand

The industry believes that after several years of exploration and development of LED road lighting, through the accumulation of technology and product improvement in the application process, the market continues to grow steadily and its development opportunities are re-emerged. At the 8th China International Semiconductor Lighting Forum "LED Road Lighting Market and Technology Application" Summit, many technical experts and corporate executives gathered together to use the environment, optimize the design, the consumer's feelings and how to implement the LED light source. Scientific evaluation and other aspects to explore how LEDs can be better applied to road lighting, how to obtain a safer and more comfortable road lighting environment. From this, we can feel that the technology and product application of LED road lighting has taken a big step in a more in-depth and more humane direction.
Zhu Mudao, head of the optoelectronic component and system application group of the Institute of Optoelectronics, Institute of Optoelectronics, Taiwan, optimizes the design to meet the requirements of human eye comfort. LED road lighting products need to follow the relevant technical specifications of road lighting to meet the requirements of ground illumination and regional brightness. LED manufacturers are concerned about the efficiency of light extraction. However, for the user, the final concern is the quality of the light that the human eye feels in a specific environment. There is a conversion coefficient between the light extraction efficiency and the light quality. This coefficient is Environmentally relevant, so a lot of specific research work needs to be done before the installation of road lighting products, it is impossible to apply a specification everywhere.
LED lighting products should be highly integrated with the user's needs based on a deep understanding of the physical characteristics of the LED light source, such as the combination of the human eye's perception of light and the use of the environment to develop a truly humanized lighting product. Reasonable optical design is an important aspect.
Several commonly used optical design methods mainly include: (1) adjusting the light type by means of a structure, that is, arranging the light source cells into a plate array, and then tilting the light plate to adjust the required light type distribution. The biggest advantage of this optical design is that the cost is very low, but it is not easy to achieve in order to meet higher light quality. Of course, the monomers can be tilted to different degrees with each other, so that the superimposed light type conforms to the street light. demand. (2) Using a secondary optical design, an optical design element, such as a reflector or lens, is used to achieve the desired light distribution. In this way, the monomer can be standardized and has high elasticity, which can separate the LED unit from the optical design, so that the design is more flexible, so as to meet the environmental requirements of different roads. (3) Using a primary optical element, the light output of the single unit is directly guided by the package lens on the LED unit into a desired distribution form, which reduces the inconvenience in structural design. The asymmetrical distribution in the direction of the road surface can be achieved by tilting the light board or by designing the light source lens, which simplifies the integration, but the design cost and manufacturing cost are high. (4) The use of light guides is only found in patents, but it has not been used in terms of products. This design method has large optical loss but is easy to maintain and can meet higher light quality requirements. Future road lighting needs to integrate these technologies, as well as command and control technology and network management technology.
Zhu Xiaoyan, a senior researcher at the Lighting Systems and Applications Department of Philips Shanghai Research Institute, Philips (China) Investment Co., Ltd., found that the 3000K warm white LED street light is more comfortable. When it comes to the challenges of LED road lighting, people often mention product quality challenges, such as Life, reliability, light decay and return on investment. But the product is for lighting, and the end user is concerned about whether there is glare, whether the sidewalk is too dark, whether the white light is comfortable, and whether the illumination is high enough. Energy conservation is not only the energy saving of the product itself, but more importantly, the energy saving of the application effect is a comprehensive consideration based on the safety and comfort of the lighting environment.
Road lighting is for road safety services, first of all to meet the basic needs of safety. Safety is related to visual function, which involves factors such as response time, perceived rate, disability glare (TI) and face recognition. Secondly, further consideration is needed for comfort. Visual comfort involves factors such as color temperature, average brightness/illuminance, brightness (illuminance) uniformity, glare, and environmental ratio.
Philips has done a lot of research on the visual comfort of LED road lighting, such as the LED street lighting sensory evaluation experiment in Apeldoorm, the Netherlands, the outdoor warm white lighting effect user feeling evaluation test in Lyon, France, the outdoor warm white lighting in Suzhou, China. The effect of the user feels the evaluation test, the effect of color temperature in Shanghai on the uncomfortable glare of road lighting.
According to the feedback from respondents, LED street lighting can be actively accepted, because LED is an energy-saving, sustainable light source, LED is expected to improve the visual and security sense of lighting, new products with innovative design are always subject to welcome. Overall, when the contrast between street surface illumination and sidewalk illumination is small, lighting fixtures and effects are very easily recognized; in general, warm-colored LEDs are considered comfortable. Of course, LED road lighting also faces some criticisms: if the lighting source is too bright, the glare is serious, the lighting is too strong and glaring, it will interfere with vision and sight.

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