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Illuminance and brightness do not all represent the quality of road lighting. At present, road lighting is dominated by high-pressure sodium lamps. With the entry of LEDs, lighting quality parameters will be further refined. Lin Yandan from Fudan University mentioned in this lighting forum that the high color rendering will improve the recognition rate of the whole road. In order to improve the road safety, the identification is based on the brightness. Now even the brightness is the same, the color is different. It is also possible to distinguish the object from the road surface, thereby improving the overall road lighting quality and safety factor. Therefore, I think LED street lights can do lower brightness than previous sodium lamps and theoretically achieve the same recognition rate. Under this premise, when doing energy-saving replacement, we do not have to pursue the high brightness before, in order to achieve the economic benefits of the society.
At present, more people pay attention to the standardization of product module size, interface, drive current, etc. I hope that the same attention should be paid to the light distribution and application standards. Because product standards have not yet been fully unified, it is difficult to standardize from the market perspective. However, when the industry entry threshold is low, many companies will flood in. Therefore, after strict standards are introduced in the future, the entry threshold will be increased and the number of brands will be reduced accordingly. Traditional lamps have experienced these pains, but as the market, price, cost, and resources become more stable, the advantages of standardization will emerge. The world's general trend will be long-term, and the products will be standardized. At this stage, it is also confusing for users to choose products with different standards. The introduction of standards will be a boon for users and manufacturers. At the same time, not only will lighting products be standardized, but lighting control systems will also be standardized.
The entire industry is in the stage of rapid development and integration, and basically large-scale enterprises, both domestic and foreign, hope that the technical standards will be introduced. Without rules and regulations, everyone wants to stand on the same starting line and compete for design, manufacturing, quality control and maintenance on a relatively fair stage.
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Current Situation of Road Lighting and Prospects for the Future
The high-pressure sodium lamp is mainly used in the early stage of the street lamp. The advantage is high efficiency, but the color rendering is poor. In the later stage, the ceramic metal halide lamp and the high-pressure (low-pressure) mercury lamp are added. The advantage is that the white light has high color rendering and the human eye adapts well, but the luminous efficiency is good. No high pressure sodium lamps are high. The biggest advantage of LED is energy saving. The LED street lamp of about 80W can replace 150W high-pressure sodium lamp. From the whole system, the energy consumption of the high-voltage sodium lamp is relatively large, and 15% energy loss is generated. LED electronic Drive, its loss can be reduced to 10% or even 5%, so the same brightness, LED energy can be halved than the high-pressure sodium lamp energy loss. Although the price of LED street lamps may be slightly higher, it has the advantages of maintenance-free, dimmable, and control. From the perspective of the entire power supply system (including cables and transformers), the advantages of LEDs are more significant. We have calculated that If a street lamp is replaced with an LED street lamp, the investment can be recovered in about two years. If it is a new project, the initial investment is lower than the use of traditional lamps.