As a matter of fact, Boffin1 i think is right with his remark about the wrong forum part.
As your question is about LED and this part of the forum is called LEDs and multiplexing, i think you might have thought this to be right.
However, General Electronics would have been the better choice in this case.
But that doesn't mean your questions shouldn't be answered if possible.
So if you have any more questions, just ask.
A moderator might move this thread to another forum part if they decide that to be more suitable.