I agree with the last poster, a hand held is more versatile and cheaper. It's hard to beat a 2 million Brinkman corded....don't mess with rechargeable. I always put a longer cord on mine so I can move from front to back of the boat and take the light with me. If you are by yourself it's easy enough to run the motor and handle the light and if someone is with you with the longer cord they can sit up front and handle the lighting. I use one running to the duck blind and do a lot of jug fishing using one....never fails to work!
Headlights, such as KC lights, are not illegal and very common on duck boats, but generally speaking they are fixed position and you only see where you are pointing. Night time boating isn't like driving a car..there aren't two lanes of traffic going each way where you have someone coming at you constantly so no worries of night blindness unless of course some jackwagon tries to shine you on purpose.
Chris