First off, I have to say that's really cool that you're fishing for trout at night from a boat!
I've only done it from the bank. Must be really nice on a boat at night.
Keep your lights off as much as possible. Don't shine it on the water. It takes about 15 minutes to get used to the dark but once you do you'll be surprised by how well you can see in the dark, especially after an hour or so.
If you use a light, use a headlamp that is a low lumen light or one of the red colored ones. I think there's a green color light that I've heard is better than red. Red doesn't work for me. So I use a low lumen head lamp for tying leaders on or snapping on lures. Other than that, it's lights out!
One of the best ways to think about night fishing is to visualize that everything is creeping about trying not to be seen. Fish are relying on their lateral lines to sense the movement of things to eat.
Slow movement is the order of the night. Imagine that everything is creeping around on tip toe trying not to be seen or heard.
It is very unnatural for something to splash around or to swim with lots of commotion during these circumstances.
I like fishing a soft bait on a light jig at night. Or else a soft bait with a small split shot. Then creep it back slowly. Seems to work well.
Fly fishing people like to use mice flies, fishing flies that look like mice. Apparently the really big brown trout are suckers for mice and voles that fall into the water.
I've never had success fishing spinner lures at night, probably because it too noisy and splashy. But I read a book by a guy who did it and he said he used to toss it out then let it sit for a few minutes before he began his retrieve. He didn't say how big his spinner was but I suspect it was a very light and small one. The waiting was probably to let the fish settle down after being spooked by the splash down.