My question is, can you wire a LED light to your existing bow light and make them work on 1 switch, or should a seperate wire be run and a switch. Being the amp draw is so low on these lights I would imagine that the bow light wire could handle it. I am not much of an electrician, so any pointers would be helpful. Thinking about going with the E series flood 4" or 6" flood spot combo. Maybe smaller like the D2, not sure yet.

You can do it with adding a switch between the current switch wired to the nav lights. The switch would go to the Rigid lights. However, I would not recommend doing that because if another boat approaches you are going to have to kill the Rigid lights as they are too bright. If you killed the rigid light that is wired staring to your nav lights then you kill your nav lights too. Not recommended.

Use a separate switch IMO.

Thanks for the info. I hadn't thought about oncoming traffic