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In recent years, LED road lighting has developed rapidly and has achieved certain results. At the same time, people have a new understanding of the overall performance of LED road lighting, such as light distribution and color temperature. For example, LED road lighting with color temperature of 4000K and below, Meet the visual needs of people.
LEDs have the characteristics of low energy consumption, concentrated light, rich color, and varied images. "But some features are applied to LED road lighting, which is not an advantage. It is just a weak position."
LED street lights are not energy efficient in the end?
At the end of last year, the three ministries in the bidding documents stipulated that the overall energy efficiency of LED street lamps was 85 lm, but in fact many companies indicated that it is difficult to achieve this target.
According to 80 lm calculation, if the light effect is effectively utilized, 90% of the LED street light is irradiated on the required road surface, then the overall effective use of the LED street light is 72 lum/w.
The high-pressure sodium lamp has a luminous efficacy of 120 lm/w and a luminaire effect of 70 lm/w (the minimum efficiency for road lighting standards specified by road lighting design standards is 70 lm/w). Therefore, the use of high-pressure sodium lamps is more diffused than LEDs, and if the effective utilization rate of high-pressure sodium lamps is 80 lm/w, the overall energy efficiency is 67 lum/w.
“Under the same conditions, the overall luminous efficacy of LED street lamps is 72 lum/w, which is more energy-efficient than that of high-pressure sodium lamps 67 lum/w. Compared with Philips lighting cosme, due to its small illuminant, the light distribution is better, and the luminous efficiency is 140 lm. /w, very suitable for road lighting. Under the same conditions, the efficiency of cosme lamps is about 5% higher than that of high-pressure sodium lamps, and the overall effective utilization value is 89lum/w". Zhao Jianping analyzed the three different lamps under the same conditions. Overall effective use of value.
From these three data, cosme is the most energy-efficient, followed by LED, then high-pressure sodium lamp, LED does not have cosme energy saving, but applied to road lighting field than high-pressure sodium lamp energy saving.
“And the real energy saving of LED is reflected in replacing traditional incandescent lamps, such as hotels, residential buildings, etc., replacing 6W LEDs with 6W LEDs can save more than 70% energy. If you use 25W LED lamps to replace 100W halogen lamps Energy saving is also above 70%," Zhao Jianping told reporters.
Where is the energy saving potential of LED , how to save energy?
"Compared to high-pressure sodium lamps, the biggest advantage of LEDs is that they are flexible and can change power," said LED streetlight experts.
LED is used in the field of road lighting. If you work 10 hours a day and 5 hours in the middle of the night, then energy saving is mainly reflected in the latter half of the night. Thanks to the introduction of the control system, by adjusting the voltage, two-thirds of the power can be reduced. And according to the operation of the vehicle, automatically adjust the light and reduce the power.
“Adjustability is an excellent advantage for LEDs in the field of road lighting. From this aspect, it reflects the energy-saving effect of LED road lighting.â€
In addition, the biggest feature of LED is that the single power is relatively low. "For high-pressure sodium lamps, this road does not need 250W, and 200W may meet the road lighting design requirements. But LEDs can be used in road lighting to provide 200W lamps."
Therefore, LEDs have low power characteristics and are not limited by specifications, which can achieve energy saving effects. â€
LED road lighting energy saving needs prerequisites
"On the backbone road, it may not be possible to use a 400W light source. It is possible that the 360, 350W light source can meet the design standard. In this case, the 400W high-pressure sodium lamp can not reduce the power, it will be powerless, and the LED street light can be used. Reflecting its energy-saving effect, Zhao Jianping said that controllability is a major factor in energy saving for LED road lighting.
Energy-saving conditions are also reflected in the intelligent control of its configuration. LED road lighting plus an intelligent control system is a better way to save energy, and can fully utilize the flexible control of LED.
Strong light source is also a big feature of LED, but if not properly used, it is easy to cause light pollution. LED road lighting to achieve energy-saving while also considering environmental factors, according to the specific road to design suitable lamps. "For example, many companies produce a giant luminaire, flaunting its illuminance value is very uniform, but may not be enough brightness, and may not be suitable for road lighting." Zhao Jianping said that the use of LED road lighting should also consider the visual needs of pedestrians and drivers.
Energy saving is a prerequisite. The use of LEDs does not necessarily save energy. It is necessary to save energy under certain circumstances. If these factors are taken into account, LED road lighting does have energy-saving effects. 
Whether LED road lighting is energy-saving, it also needs certain conditions
"When it comes to LED, the first thing that people think of is energy saving, but whether LED road lighting is energy-saving, under what conditions can we really save energy, is the problem that the whole industry has to think about now," Zhao Jianping, an expert of lighting industry association, held a seminar at Philips. Said.