When you said Navigation lights I was thinking inside the car. Duh. If you are using high wattage LEDs think of using a buckpuck they are current regulators not voltage regulators. You can use one to power several LEDs if wired right. You might be able to power 4 LEDs in series with one or power two strings of 2 or 3 with one. Of course you will have a lot of wiring to do to make it work. Or a lot of expense powering each one with it's own.
Still you might do ok for nighttime use with smaller LEDs and a resistor at each light. Or just use a larger resistor on your one watt and use less power. I doubt if you need that much light for marker lights.
I tried setting up LED taillight/brakelight on my road motorcycle and ended up going back to standard lighting as the quality of lighting was not the best.
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