Hey Man
Salmon are crepuscular feeders(low light feeders) who rely on seeing their prey. It is true that low light times are the best but I do not believe that you will catch more or bigger fish if you went out at night. I do however have some exceelent luck fishing predawn and dawn as well as predusk and dusk. I find in lowlight times a slightly darker lure works great and as light increases using a presentation with some flash triggers more strikes. This is just personal experience so by no means am I stating strict textbook type facts. Good Luck