I have 3 standard LEDs (not COB just the tiny regular ones used in circuits with an Anode and Cathode in epoxy lens), I was just testing them today doing random things with them:
1.9v - 2.1v = red
3.0v - 3.4v = green
3.0v - 3.2v = blue
I think they're about as standard of an LED you can get. Anyway I have a variable power supply when I connect an LED to either the negative or positive (doesn't matter) and touch it to me or touch it to the ground it lights up. I can do this for any color and any polarity. I'm confused? It doesn't work on anything unless it's a conductive thing.. ie me, metal, the ground... but the ground is for AC electricity only? DC goes from positive to negative terminals? My variable power supply is floating, I put it on a bungee cord on my ceiling just to test it out..
So basically if I connect the positive OR negative (Anode or Cathode) to the variable power supply positive or negative (does not matter, any way works) and I touch it, it lights up. My PSU can be on 0 volts 0 amps and it still lights up. The power supply itself doesn't show any amperage draw ... so I am thinking it's leaking AC or something crazy and that is going through me and lighting the LEDs? can they run on like 1 volt AC? I can't imagine 1 volt would travel through my body's resistance? I can't feel it at all, I've been shocked by 15volts AC before and you can feel it pretty decently so not sure if anything lower can even travel through my skin.
I'm ok at electricity, I understand the basics so I've been able to test some things as I said above but still not really sure what to say about this. I have a multi meter that measures no resistance at all as in, infinite ohms or no connection for electricity to flow. It goes insane when I turn it to DC reading, like numbers from -300 to +200 and it sits at 20volts AC when I turn it to AC. But I can touch the power supply end to the ground or to a metal rod I put in the ground and I get no spark or anything.