Hey Cobb, I will try to give you some more info based on my experience.
Dive Rite 10w cannister - great for caves but was much too bright for a night dive. My experience was the same as Ianr33.
Salvo handheld 10w -have not used on a night dive but based on my cave experience, it would be too much.
UK C-4 LED (5w) - my daughter uses on night dives, and it is a nice light. Princeton Tec has a similar light.
UK C-8 LED (5-6w)- I use this for night dives and it is fine. If I were to replace it, I would go with the C-4 because it is smaller and lighter. In mt opinion, any extra light from the C-8 is not worth it. Princeton Tec has a similar light.
Photon Torpedo (5w) - I have used this before for night diving and it performed well.
Princeton Tec tec 40 (?w) - I have used this as a backup and primary at night, and it has been OK. Sometimes, I just like a little light especially when others around me have brighter lights. My daughter and I have each had one to flood but they were replaced under warranty. You have to be careful with turning the light on and off. or it could flood or stay on (because of pressure) It only has one o-ring where the photon has two o-rings.
For light wreck, I would use the Dive Rite if in doubles or the Salvo HH, C-8, or Photon if using a single tank.