I think the first thing I would want to know is what kind of fish you are after.  As far as night fishing, I have tried it and don't like it.  Everything is just too difficult in the dark even with a headlamp.  I have gone in late August and have worked my way down to 20 and 30 feet tail dancers.  My experience is that the larger fish are deeper.  As far as lake trout are concerned, you probably need to get down at least 40 feet to get to their desired temperature.