Hi Larry,
I'm going to give you a different answer than you're expecting. The only light I carry is a mag lite to shine in a circle when I arrive at my gunning destination to see if anyone else is set up in the vicinity. Otherwise, I've always felt strongly that using your night vision to navigate and to set up was superior to the the often distorted view you get from light reflected off of walls of vegetation. I used to manage and live on Thief Lake - one of Minnesota's better duck hunting destinations. The view out my picture window of the marsh in the wee hours of the morning was something to see - the battle of the Q-beams like light sabers in a Star Wars movie. Interestingly, these light shows became less dramatic when GPSs came along, and the light wasn't as necessary to find your location.
Thief Lake is a large (7100 acre) marsh that at normal fall lake level is~3.5' deep, and contains thousands of hardstem bulrush and occasionally phragmites islands and points. Typical hunting procedure is to find a suitable island or point with the wind in your favor, throw out your decoys,and slip your boat into the bulrush. On most WMAs in Minnesota, motors are not allowed (minimizing disturbance). On Thief Lake and some of the other larger lakes (again, just on WMAs) motors of up to 10 HP are allowed. Speeds are pretty moderate.
Now, having said all of that, I have had times when the sun came up and I've set the decoys in a little bit tighter than I intended. Oh well - time to adjust the spread.
Just to make things interesting, in Minnesota, boats used for duck hunting are not required to have running lights.
Joel