LED light resistance, I use flashlight LED lights plus resistors used in the 12V circuit can be used for a long time?
As long as your current limiting resistor is reasonable, it will not be a problem for a few years.
Your resistance value increases, the resistance value of 1K can be (but may be dark light)
If only a single LED lamp and resistor, so voltage resistor consumes basically is 12-3=9V, working current of 60mA lamp, then the power loss of resistance to 0.06x9=0.54W, so the use of least resistance power must be above 1W, but this power is part of the battery discharge current limiting resistance loss, fever will be great
