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 the calculation of 80lm, 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 its luminaire effect is 70 lm/w (the minimum efficiency for road lighting standards specified by the road lighting design standard is 70 lm/w). Therefore, compared with the LED, the high-pressure sodium lamp is used for light distribution, and if the effective utilization rate of the high-pressure sodium lamp is 80 lm/w, the overall energy efficiency is 67 lum/w.
"Under the same conditions, the overall luminous efficacy of LED street light is 72 lum / w, compared with high pressure sodium lamp 67 lum / w, energy saving is higher. Compared with Philips lighting cosme, because its illuminant is small, the light distribution is better, the luminous effect is 140lm / 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/wâ€. Zhao Jianping analyzed the overall performance of three different lamps under the same conditions. Effective use of values.
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 of LED in the field of road lighting. From this aspect, it reflects the energy-saving effect of LED road lighting.
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 needs of road lighting design. However, LEDs can be used for road lighting and can 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.
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