LED Road Lighting Application Status Analysis

In 2012, the China Academy of Building Research tracked and tested 44 semiconductor lighting projects, including the National Development and Reform Commission's semiconductor lighting product application demonstration project, the cross-strait semiconductor road lighting project, and daily commissioned road lighting. 32 trunk roads were surveyed, the overall pass rate was only 25%, and there were 12 secondary arterial roads. The overall pass rate was 81%.

What led to a low test pass rate?

First, the light output of the lamps is not enough. Taking the bidding of LED road/tunnel lighting products of the Development and Reform Commission Semiconductor Lighting Product Demonstration Project as an example, the lamp installation height is 12m, the maintenance factor is 0.7, and the maximum single product lighting product is 14000lm, but it meets the main road lighting design. Above 20000lm.

The second is that the light distribution of luminaires is irrational. For functional lighting, the lighting distribution of the lamps is very important regardless of indoor lighting or road lighting. The light distribution of lamps and lanterns is not good or bad. The judging standard is only matched with the use place.

Luminaire light distribution largely determines the parameters of road lighting quality such as average brightness, overall uniformity, longitudinal uniformity, glare, and threshold increment.

The mismatch between the lamp distribution and the installation height, elevation angle, and cantilever length of the luminaire will result in a lower longitudinal uniformity of the luminance.

The fact that the environmental ratio does not meet the requirements and the threshold increment is excessive is an important issue that currently restricts the application of LED lighting products to road lighting.

Dean Zhao proposed the new concept of misunderstanding caused by the rectangular distribution of road lighting, which is a great misleading for LED street lighting companies. The rectangular light distribution may meet the standard illumination requirements, but does not necessarily meet the standard brightness requirements. This is due to the lack of understanding of the lighting requirements.

If the motor vehicle lane has a good light distribution design, non-motorized vehicles may not even need additional lighting fixtures.

Road lighting has made a qualitative leap since its development in 2008. It is mainly reflected in: focusing on the overall improvement of product performance; paying attention to the demand for light in road lighting - the role of light distribution; paying attention to the needs of visual comfort - changes in color temperature; The impact of specifications and modules on operation and maintenance.

In a particular case, the biggest characteristic of LEDs is controllability rather than energy saving. By adopting reasonable intelligent control technology, it can effectively reduce the lighting running time, and ultimately reduce the lighting energy consumption. This is an important application of LED lighting technology. Advantage.

Grasping the controllability of LEDs to fully reflect its energy-saving advantages is an important development direction of LED road lighting in the future. Without intelligent control, LED's energy-saving advantages will also be overshadowed.