Thanks. I did run into a bit of a problem. The bulb is too long for the headlamp. I found a 1.5V bulb. Very small and it fit nicely. The TCS WOW motherboard says it has a built in voltage reducer for LED's. Should I add a resistor to the blue 12V positive light wire ? To be extra safe.
I think the WOW board being set for LED's is a big hint that an LED should be your first choice. It may be set up to pulse with modulate the signal to the LED to do dimming and MARS light simulations. Also save you from continually replacing the incandescent light.