产品:
交通信号包括交通灯和行人步行迹象。
标准:
Current standards for traffic signals were adopted by Congress in in EPAct 2005 and went into effect in 2006. The standards set watt caps of 8-13 Watts for each ball (red or green) or face (e.g., walk signal) when tested at 25 degrees C. This essentially requires use of LED lights. Yellow balls can use other lighting technologies since they have very low operating hours.
加州首次采用了2002年交通信号的国家标准,2003年生效。八个其他国家(AZ,CT,MD,NJ,NY或,RI,WA)通过了CA标准,尽管所有标准,但马里兰州的标准被抢先生效前的国家标准。
关键事实:
因为第一个LED产生了单色(一种颜色)光,因此交通信号是使用它们的首款产品之一。