audioguru said:Good, we don't need to guess anymore which LED you are planning to use. Sorry about that. Didn't realise there was a datasheet there and there were so many different ones on the same sheet!
Is your supply 12V or 12.5V and does it have a 1.1V diode in series with it? Yes it's 12v and I have absolutely no idea if there's a 1.1v diode in series but if I knew what to look for I could take a peek.
These LEDs are the small 3mm size. They have 3-leads which makes switching them on and off separately very complicated. Erm, don't I just put the switch in between the LED and the incoming power so the switch decides which way the current is going to flow?