Hi ! Either your source for the LED's (like Digikey or whatever it might be) or the specific manufacturers data sheet should tell you everything you need to know. Jan-Erik. techy fellow wrote : > BTW, may I know where (web address) can I obtain general > specs about LED's voltage ? -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics