Brightness and illuminance in LED street lamp is contradictory?

In April 25, 2009, Aladdin lighting network invite domestic authoritative experts, held in Shenzhen "hot - rational call behind the seminar" 2009 LED application products achievements and trends, LED lighting companies, designers and terminal owners share a high level of wisdom. The seminar was warmly discussed.

A live audience is "contradiction" brightness and illuminance standard LED lamp design issues such as consulting the international standard OLED project leader, LED backlight, light radiation group members, international standard safety expert at the Zhejiang University of optoelectronic information engineering department associate professor Mou Tongsheng; Tsinghua University Shenzhen Graduate School of Physical Electronics and laser devices, Associate professor; Tsinghua University Shenzhen Graduate School of Qian Keyuan, deputy director of semiconductor lighting laboratory

Question: I would like to ask the teacher and the teacher seeks money, we know that there is a standard brightness and illuminance standard in the design of the above street, how should we consider this problem in the design of the above? If I achieve a uniform illuminance, may I see the road will see a bright spot.

Mou Tongsheng: just mentioned lamp illumination and brightness, from the human eye vision, should be based on the brightness, but a new problem is now playing a lot now in accordance with light, illumination, when we play in the following, we see the lights below are certainly the shadow. It is disadvantageous for the driver. We drive the cement road, we all know that in the distant place, there is a light in the past, is watery, not water, we look bright, this is a contradiction, in my personal opinion, the brightness is more scientific. Of course, these two must be contradictory.

Qian Keyuan: just Mou teacher said a lot, brightness and illuminance is something of a paradox in the street lamp, street lamp is not diffuse, second to the next sixty meters, if it is a rainy day fairy can not do the uniform luminance, rain water is a mirror, the driver is to speak a point is always less than the uniform luminance. Good cement road, who do the lights are very good, which is a very good point. Shenzhen hung dozens of street lamp of the road is very good, you will feel very uniform at night, but we do street we know that some road installed very difficult, do you think the distance is very uniform, zebra, brightness and pavement reflection relationship is too large, then a good road rain No. Design the road to consider this issue, do not let zebra so obvious. When talking about the brightness of the rectangle, not a photo down is a rectangle, it is to be a problem, how to cover the light, the brightness can be uniform, of course, you even a little bit of light is a good thing. Finally, consider how good this road, then, we did not dare to write this standard, so it is over. Uniform rate is not 100% is the best, may take into account the two, I think this problem is very deep, it may also do this street lamp.