0iknowvations 9 years ago Ya ! That's right. If they are for auto use, they can be operated by 12 volts. If you are not sure about the voltages, start with 5VDC or 12v DC ( battery or an adapter) and a register in between. Compare the light. If is is less, then you can go on decreasing the value until you get sufficient light but at the same time see that the resister is not getting hot. If you think that light is ok & resistor value is also ok then you need to have higher wattage resistor.