I'm running a 6v smoke unit at about 5.3 v from my battery. I'd like to put an LED in the circuit to show when the smoke unit is actually turned on without dropping the voltage too much further.. The smoke unit runs off a positive and negative lead, through a servo controlled switch (powered seperately) and into the batterty. I'm looking for a suitable red or orange LED, the resistor (if needed) and instructions on fitting.