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.