Important!
You must choose the resistor based on the current draw of your LED, and you must use one resistor per LED. See the list below for some of the common lights.
100 Ohm 5 Watt Resistor
For LEDs that draw 120mA at 12 volts
150 ohm 2 Watt Resistor
For LEDs that draw about 80mA at 12 volts
220 ohm 2 Watt Resistor
For LEDs that draw about 50mA at 12 volts
390 ohm 2 Watt Resistor
For LEDs that draw about 30mA at 12 volts
560 ohm 1 Watt Resistor
For LEDs that draw about 20mA at 12 volts
1100 ohm 1/2 Watt Resistor
For LEDs that draw about 11mA at 12 volts