wunat:I am 6'. I am using the standard Halcyon Scout lights. I find that the standard (3-C) Scouts is too long for the right side as it always comes in contact with my canister. I then replace one of the Scouts with a mini-Scout (2-C) with sits nicely along my shoulder strap with just enough room between the canister and itself.
If you are using a canister or will probably be diving with one in the future, MIGHT want to use a 2-C on for your right side. Just from my experience. Hope this helps.
Me too ... I have two older style 3 cell scout lights. I also find that the light mounted on the right shoulder harness interferes with the canister light lid. I guess this is where a 2 cell scout would be kind of nice.