The comparison of Lighting Efficiency Between LED And Sodium

At the beginning of 2006, we installed our LED street lights LU4, 112W on half of the road to make the comparison with HPS 250W.

When we brought our customers to see the lights, they asked the same question,

Why with lower power consumption and lighting efficiency, LED streetlight is brighter than high power sodiums?

As so far, The efficiency of LED lighting is not so high as that of sodium. For LEDs, it is 65-70Lumens/Watt, and for sodiums, it can reach 125Lumens/Watt.

But the spectrum of sodium is more concentrative on yellow, its color temprature is as low as 2000~2500°K. Whereas the color temperature of LED is as high as 2500~5000°K or more. The beam from the sodium scatters irregularly, most of the beam doesn't shine on the ground.

And we must admit another fact that the Ra index of sodium is 20-40, very slow. Under the shining of sodium, it is very dim and we feel very dizzy. Ra of LED is as high as 75-80, under the shining of LU4, it is brght and we feel ease.

So from the actual lighting effect, LED lighting is much brighter than high power sodium.

LED lighting of 100W can replace the high power sodium of 250W or halogen of 300W. The lamp flux of 100W LED lighting is about 6000 lumens. The illumination flux is about 16 LUX on the ground with the lamp pole 12 meters high. For the high power sodium of 250W, it can give out 20,000 lumens, but on the ground it is about 7,000 lumens. its illumination flux on the ground is 30-40 lux. Because of the difference of Ra index, here are illumination flux amendment index for LED lighting and sodium. For LEDs, it is 2.35 times and for sodiums, it is 0.94 times. So after amending, under the shining of LED lamp, it is 37.6 lux. For the sodium, it is 28.2 -37.6 lux.

That why we say LED street light can properly replace the high power sodiums.

Passion, hope remain as Paralympics close

As China brought down the curtain on a spectacular Paralympics on Wednesday, the disabled in the country began new lives with passion and hope.
Standing on her balcony, Zheng Yue held out her hands to feel the illuminating fireworks in the sky.

"The Games mean much more than sports to me," said the 18-year-old blind girl.

"They mean confidence and understanding when the Paralympians get as many cheers and applauses as the Olympians do. I am so proud of them."

Zheng said memories of the splendid Games would accompany and inspire her in future.

International Paralympic Committee President Philip Craven applauded that the Beijing Paralympics had been first class.
"I think the two Games have been of equal splendor," he said on Wednesday, referring to the country's motto for the Games.

Admittedly, the 12-day event of great splendor has become an inexhaustible source of power for the disabled in China.

For thousands of amputees who lost their limbs to the destructive May 12earthquake in Sichuan Province, the Paralympics brought new hope.

Pan Yunlong, 18, who had his right leg amputated in the earthquake, huddled with his fellow classmates to watch the closing ceremony in a gray portable house.

He retrieved his passion for basketball when a little boy tossed up the ball skillfully in the London eight-minute performance.

"Smile to life and face up to challenges — those were what the tenacious Paralympians had taught me," said the optimistic teenager in his armchair.

"I will do my utmost to become one of them."

During the sports gala, about 4,000 disabled athletes from 148 countries and regions, the largest participation ever, showcased their courage and confidence, striving to break down walls of prejudice and discrimination.

A sport event at the scale of the Paralympics has been known to speed up critical changes.

In the eastern Jiangsu Province, Wei Dongxiang listened to a radio that he got from the local government months ago. Having lost his sight for 10 years, the 35-year-old wanted to grasp every sound from the grand closing ceremony in the "Bird's Nest" National Stadium.

"From infrastructure for the disabled to people's awareness of the welfare of the disabled population — changes happened everywhere in the country," he said.

"Paralympics come and go. But I hope the care for the disabled will stay."

In a country with 83 million disabled, there will never be too much care needed.

In preparing for the Paralympics, Beijing invested 600 million yuan (about 87.7 million U.S. dollars) to install and improve accessibility facilities.

"The Paralympics got some balls rolling," said Jia Yong, sports director of the China Disabled Persons' Federation, "changes have been made, and more are on the way."

One of the essentials of Chinese culture: Chinese Calligraphy

On the opening ceremony of Beijing 2008 Olympic Games, we were totally shocked by such a grand occasions. The exhibition of elements of Chinese culture left deep expressions for us. Chinese calligraphy and Chinese painting were a very important parts of such essentials.

Here I would like present the top 5 famous Running Scripts of Chinese calligraphy.

Top 1: Lan Ting Xu
The Author, Wang Xizhi is the most famous master of calligraphy in ancient China. He created the work in A.D. 353. The original of the script is missing as so far.

Top2: Ji Zhi Wen Gao

This work was created in Tang Dynasty. The original script is collected in Japan.

Top3 : Huangzhou Han Shi Tie. Created by Su Shi, Song Dynasty

Top 4: Bo Yuan Tie. By Wang Xun, Jin Dynasty.

Wang Xun is one the grandsons of Wang Xizhi.
We call Wang Xizhi and his son, Wang Xianzhi "Two Wang". They played very important roles in Chinese culture. Both of them are not only the master of Calligraphy, but also the politicians and the litterateurs.

Top5: Jiu Hua Tie. By Yang Ningshi, Zhou Dynasty