http://japan.cnet.com/special/story/0,2000056049,20405557,00.htm

http://ranking.goo.ne.jp/ranking/028/trenditem_2009/

http://gigazine.net/index.php?/news/comments/20091227_led_actual_brightness/ http://gigazine.net/index.php?/news/comments/20091226_led_electric_bulb/

http://www.jiji.com/jc/c?g=soc_30&k=2009122800015

http://news.www.infoseek.co.jp/topics/society/n_mhlw2__20091225_3/story/20091225_yol_oyt1t00498/

http://mainichi.jp/select/wadai/news/20091228ddm041070039000c.html

http://mainichi.jp/select/today/news/20091228k0000m040090000c.html