日々更新mobilerA8（Yahoo!ニュースを毎日ウォッチ）

BBCより。光害、light　pollusionをＬＥＤの道路照明などの新型を採用することで減らし、すごくきれいな夜空をみんなに、ということ。
http://www.bbc.co.uk/news/technology-22292129
LED streetlamp aims to improve public's view of stars

Researchers believe they have come up with a new type of LED-powered streetlamp that could radically reduce light pollution.

Current designs "leak" large amounts of light in unwanted directions, obscuring views of the stars, wasting energy and making it harder for drivers to see.

The team, based in Mexico and Japan, said they believed their solution was the "best ever reported".

However, they have yet to turn their theory into a working prototype.

The study - carried out by scientists in Mexico and Taiwan - appears in the open-access journal Optics Express.
LED lens

According to the researchers, conventional street lamps - which use high-pressure sodium or mercury vapour - scatter up to 20% of their energy horizontally or vertically because it is difficult to control their beams.

It is easier to direct light from LEDs because it is being emitted from a smaller area.

So, while manufacturers controlled the direction of the light rays from older lamps using a reflector typically made out of polished aluminium, they can now take advantage of lenses to be more precise.

The researchers say the best LED (light-emitting diode) streetlamps on the market direct about 10% of their energy horizontally or vertically.

But they claim their own invention could further reduce the amount to just 2%.

Their proposed lamp uses three features to ensure the vast majority of its light is limited to a pre-determined rectangular shape covering the road:

光の公害とは漏れだす光のこと。
これを抑えることで、夜空が綺麗に見えるということ。
道路の照明なら道路をきちんと照らして、光の漏れを少なくすればよいでしょうということだ。

夜の地球儀 普及版 「エンディミオン」 新品価格 ￥11,000から (2013/4/26 08:45時点)

大人の科学マガジン Vol.09 ( プラネタリウム ) 新品価格 ￥2,200から (2013/4/26 08:46時点)

☆家庭用ホームプラネタリウム 組み立て式 ロマンティック☆星空　工作 自由研究 インテリアに最適！ ムード作りにも！ 新品価格 ￥1,290から (2013/4/26 08:47時点)