LED road lighting is also required to have certain conditions for energy saving

"When it comes to LED, everyone first thinks about energy saving, but whether or not LED road lighting is energy-efficient requires real conditions to save energy. This is a problem that the entire industry has to consider." Zhao Jianping, a lighting industry association expert, held a seminar at Philips. Indicated.

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, color temperature, etc. For example, LED road lighting with a color temperature of 4000K or less, more Meet people's visual needs.

LED has the characteristics of low energy consumption, concentrated light, rich color, and a variety of images. "But some of the features used in LED road lighting are not an advantage. It is a disadvantage."

LED street lights in the end is not energy-saving?

At the end of last year, the three ministries and commissions stated in the bidding documents that the overall energy efficiency of LED street lights was 85lm, but in fact many companies indicated that it was difficult to achieve this target.

According to calculation of 80 lm, 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 efficiency of 120 lm/w, and its lighting effect is 70 lm/w (the minimum efficiency required by road lighting design standards for road lighting standards is 70 lm/w). Therefore, compared with LED, the use of high-pressure sodium lamp light distribution, and if the effective utilization of high pressure sodium lamp is 80 lm / w, the overall energy efficiency is 67 lum / w.

“Under the same conditions, the overall efficacy of the LED street light is 72lum/w, which is higher than that of the high-pressure sodium lamp 67lum/w. Compared with Philips lighting cosme, due to its small luminous body, the light distribution is better and the luminous efficiency is 140lm. /w, is very suitable for road lighting. Under the same conditions, cosme lamp efficiency is about 5% higher than that of high-pressure sodium lamp, and the overall effective utilization is 89lum/w”. Zhao Jianping analyzed the three different lamps under the same conditions. The 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 energy-saving cosme, but it is applied to the field of road lighting energy-saving than high-pressure sodium lamp.

"The LED's real energy saving is reflected in the replacement of traditional incandescent lamps, such as hotels, residential buildings and other places, with 6W LED instead of 20W incandescent lamp, you can save more than 70%, if you replace the 100W halogen lamp with 25W LED lamp Energy conservation is also above 70%," Zhao Jianping told reporters.

Where is LED energy saving potential, and how can it save energy?

"Compared to high-pressure sodium lamps, the biggest advantage of LED is its flexible control and variable power," said LED street lamp 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 part of the night. With the introduction of a control system, two thirds of the power can be reduced by adjusting the voltage. And in accordance with the operation of the vehicle, automatically adjust the light and reduce power.

“Regulatory control is a very good advantage of LED in the field of road lighting. It shows the energy-saving effect of LED road lighting in this respect.”

In addition, the biggest characteristic of LED is that the single power is relatively low. “For high-pressure sodium lamps, this road would not require 250W, and it may reach road lighting design requirements at 200W. However, LEDs can be used to provide 200W lamps for road lighting.”

Therefore, due to the low power characteristics of the LED, it is not limited by the specifications and can achieve the effect of energy saving. ”

LED road lighting energy-saving need preconditions "In the backbone road, may not use 400W light source, 360, 350W light source may be able to meet the design standards, in this case, 400W high pressure sodium lamp can not reduce power, it will seem powerless , And the use of LED street lights can reflect its energy-saving effect, "said Zhao Jianping, regulation is LED road lighting to achieve energy-saving a major factor.

Energy-saving conditions are also reflected in the intelligent control of their configuration. LED road lighting plus an intelligent control system is a good way to save energy, which can give full play to the characteristics of LED control flexibility.

Strong light source is also a major feature of LED, but if not properly used, it will cause light pollution. LED road lighting to achieve energy conservation, but also consider environmental factors, according to the specific road to design suitable lamps. “For example, many companies produce a giant luminaire that advertises a very uniform illuminance, but may not be bright enough to be suitable for road lighting,” said Zhao Jianping, who also uses LED road lighting to consider the visual needs of pedestrians and drivers.

Energy-saving is a prerequisite, the use of LED may not be able to save energy, but to save energy in certain circumstances, if these factors are taken into consideration, then LED road lighting does have energy-saving effects.