FWIW..I think I they are crap..My wife has the ACB20 ..Wanna buy them??? Whats wrong with a weight belt and keeping your cash for something better ..like a scooter
I believe other than the ACB 30 you cannot use a Canister light ...that in its self tells me enough ..
Could try a combo of Fixed ie P Weight on B/P and some ditchable on a weight belt..
Mind You your Light is part of your weighting
Andy