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The LED light source is a product being tested and promoted, and the color temperature used has gradually decreased from the original high color temperature of the pursuit of high efficiency, from the original 6000K to the current 4000K or lower. Reports of the use of induction lamps for auxiliary roads, non-motor vehicle lanes and residential areas have also been reported, but the total number of uses and places is not much, far less than CPO, less than LED.
Another kind of LEP (Infinite Metal Halide Lamp) is also known, but the application is rarely reported.
3. In recent years, LED street light products used in foreign countries have three noteworthy trends for street lamps in foreign countries:
(1) In the form of using LED light source, in order to facilitate maintenance, the trend of adopting modularization is becoming increasingly clear. The most representative organization is ZHAGA, and the representative form is BOOK4.
(2) The surface shape is simple and easy to maintain. The DOE's entry road (gateway) is a road light. The PHILIPS LED light is more representative of the RoadView series, as well as the British-made Woodhouse and URBIS street lights.
(3) Most of the street lamps currently in use are used for auxiliary roads, not roads running high-speed motor vehicles, and most of them replace 250WHPS.
4. Entering the road lighting standards in Europe, America and the world after the 21st century (1) Overview Road lighting standards are the most important technical support to guide the development and development of road lighting design and lighting equipment. Throughout the road lighting for more than half a century The standard content can be seen, people's changes in the perception of road lighting and development trends, Table 2 lists some of the changes.
The development and advancement of road lighting is inseparable from the development of transportation and the improvement of vehicle technology, and is also related to the increasingly busy urban transportation network. Since the earliest 1960s, the road lighting standard for the evaluation system on the road surface began to gradually improve to the brightness evaluation of the road surface of the motor vehicle and the illumination evaluation of the non-mixed road. Recognize the improvement of depth and the improvement of measurement indicators. After entering the 21st century, for road lighting, green requirements and low-carbon technologies have gradually developed into the main theme of technical work. According to the analysis, from the perspective of deep understanding, the lighting level on a road should not be static. That is, the brightness and darkness of the road at night will remain unchanged and it is not in line with the energy demand. It should be related to traffic flow, traffic speed and road surface. The combination of factors such as the state and the surrounding environment, together with many factors such as personal safety and accident rate, are considered together. Especially on almost all roads, traffic flow will fluctuate greatly with time. The existing lighting method is precisely that after turning on the lights, the lights are not turned off or adjusted until dawn. At present, even if there is a half-power control method at night, most of them are timed, and have nothing to do with traffic flow.
The formulation of the new standard lays a theoretical foundation for the energy saving of road lighting, making the road lighting intelligent into reality. At the same time, the update of lighting equipment (street lights and control systems) points out the direction and proposes new topics. And the content, so that the original seemingly traditional and unchanging old industry gives new meaning and rejuvenates youthful vitality.
In addition, the calculation of the intermediate visual contribution of the white light source considered in the two standards published in the UK in the past decade (2003 edition and 2013 edition) has changed from a relatively coarse method to a more quantitative one. The move has not yet responded in other countries, and it is estimated that there will be convergence in the future. 
