There is some unknown factor here. I need to use an LED to light an area of a device. The device has a 12V, 6A power supply. I was expecting to have to reduce the current from 6A in order to use the 12V LED but the LED is working as -is, connected directly to the 12V, 6A supply. How can this be? I expected the LED to get hot or to burn out. It isn't even getting warm. I'd like to know why.
Power supplies don't push current; loads pull. 6A is the maximum current that the supply can provide, but it's perfectly happy to supply less. If you have a load that's rated for 12 volts and you attach it to that supply (or any other 12 volt source) it will draw the current that it needs.
The LED already contains the appropriate resistor to reduce the current to an acceptable level given a 12V power supply.
You had to connect a 12V LED directly to 12V! There is a build in resistor, so the current will be fine.