With the development of the semiconductor lighting industry, the standard that can guide the industry's progress without hindering the development of LED technology has become the object of the industry's “everything to callâ€. In the case of rapid industrial development and the introduction of national standards, local relevant departments have combined the local conditions to standardize the situation of disorderly competition, and have successively issued technical requirements for LED road lighting products, which have played a role in guiding norms to some extent. But there are some notable details. In response to this, for the technical specifications of LED road lighting products, combined with the specific content of some LED road lighting product technical specifications, the reporter interviewed Xu Liancheng, deputy general manager of Guangdong Zhaoxin Lighting Co., Ltd., in order to improve the local standards. Inspired and helped.
How is the initial color temperature and initial light effect of LED street lighting products set?
Xu Liancheng: It is recommended to specify in the specification that the initial color temperature and the nominal color temperature error of the whole lamp should be less than 8%, and the single LED color temperature deviation is less than 15%. The initial light effect, generally different color temperature category LED road lighting products have different requirements. In some local technical specifications or standards, the initial luminous effects of Class A, Class B, and Class C are greater than (50 lm/w), greater than (55 lm/w), and greater than (60 lm/w), which is significantly lower than the market mainstream. The product parameters are adjusted according to the mainstream products. The initial light efficiency of the whole lamp (the measured light flux of the whole lamp / the measured power of the whole lamp) is recommended to be adjusted to be greater than (60lm/w), greater than (65lm/w), greater than (70lm/w). .
In some local technical specifications, single-light control and multi-level dimming are regulated. How do you think about this?
Xu Liancheng: After the application of LED road lighting products, it is better to control the single lamp and grouping according to the needs of use. Single-lamp control not only improves the cost control but also increases the construction requirements, and the application is of little significance. Only the regional control is required to meet the application. For multi-level dimming, it is recommended to meet the requirements of the lamp to achieve energy-saving operation at different power levels. The design of the dimming stage is 30%-100%, that is, the brightness (energy saving) control is refined, and the implementation difficulty is not increased.
After the application of LED road lighting products, what suggestions do you have for the development of lighting standard values ​​in terms of energy efficiency?
Xu Liancheng: After the application of LED road lighting products, the energy efficiency standard values ​​include various aspects, such as road surface brightness and road illuminance, glare limit threshold increment T1 (%) maximum initial value, environmental ratio SR minimum, etc., road surface brightness It also includes different indicators such as average brightness and total uniformity minimum. The requirements for different road type standard values ​​are also different. Taking the vehicle traffic road lighting standard value of a certain place as an example, the minimum uniformity Uo in the road surface brightness is determined to be 0.4, and the vertical uniformity UL minimum is set to 0.7. When white light or warm white light source is recommended, it is recommended to adjust the uniformity index appropriately based on the excellent characteristics of LED. The total uniformity Uo is 0.6, and the vertical uniformity UL is 0.8.
The color rendering index is an important indicator of LED street lamps. How should the initial color rendering index of road lighting products be formulated?
Xu Liancheng: Some local standards stipulate that the initial color rendering index Ra of LED road lighting products should be greater than 65. In fact, the color rendering index should be classified and set, and it is best not to cut across the board. For the warm color light suitable for road lighting, the current technical level should increase the light efficiency and color rendering index at the same time. It is obviously too high. It is recommended that the color temperature index of the warm color light of about 3000K requires a color temperature color rendering index of 58,4000K-5000K. The color temperature index of 65,5000K or more is required to be 75.
How do you view the choice of light source and the use of lamps for road lighting products?
Xu Liancheng: The manufacturers in our industry should be responsible for the development of the industry. It is not recommended to start from their respective “interestsâ€. What light source manufacturers need to do is to improve the light efficiency of warm white light. Public opinion is very important for the choice of products. The choice of light source for road lighting products should focus on public opinion. We should listen to the recommendations of the street lamp department for the practical use of warm white light in road lighting. At the same time, we should also listen to the views of the people. When selecting a luminaire, attention should be paid to its direction inducibility. Light poles and luminaires should be properly installed along the road to provide the driver with visual information such as the front direction, line shape and slope. Today's LED street lamps are mostly rectangular in shape, which is quite different from the streamlined design of conventional lighting fixtures today. Do you pay attention to the fact that the installation angle of LED street lamps below 5 degrees will affect the driver's visual inductivity.
What issues should be paid attention to in order to develop or improve the standard specifications for LED street lamps?
Xu Liancheng: There are also several issues that should be noted. First, in terms of light distribution, it is necessary to study a lens that can be applied to different pole heights and different lamp distances only by adjusting the power. At present, urban road lighting standards have no requirements for lighting distribution. The key to road lighting is uniformity. General lenses should be considered to accommodate different lamp poles and different lamp distances. Expansion. Second, in terms of design requirements, the future should focus on modular design. The bottleneck of maintainability, IP protection, mass production, and breakthrough of high-power power supply should be the future development direction. Third, attention should be paid to the standardization of power. The power of lamps should be standardized like conventional lighting, which is also beneficial to engineering design. In addition, many neglected the problem of wind resistance. The formulation of standard specifications should learn to master the concept of conventional lighting design, and design products that meet the requirements of lighting products and can exert LED strengths. In addition, the lightning protection performance of road lighting products is particularly important. Whether it is street lights or other outdoor lighting products, lightning protection must be provided. The voltage protection of LED road lighting products against lightning strikes should be no less than 2kV (line-line) and 4kV (line-ground).
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