送交者: 008 于 2009-04-08, 12:01:14:
回答: “100毫米外还剩余一定的光强，SAY 50”！一个LED好了。 由 JFF 于 2009-04-08, 11:41:15:
emitting angle 6 degrees, which means it is a 10mm spot at 100mm distance. If you are using two of these LED, separated more than 10mm, you don't need a light pipe.