Hi, I just got a 3 watt 80 luman led that I hooked up which works great but the only possible problem I just noticed is that when using a online led calculator some show that the resistor goes on the positive line and some show that it goes on the negative side. I hooked it up on the negative side as that was the first diagram I came across when doing this, wasn't till later that I noticed both ways are shown. It works now but I just don't want to burn it up if should be on the pos side.
Which is correct? the pos or the neg side?
3.4 - 3.6 v
2 watt 2.2 ohm