I think your calculations might be a bit off. If you measure the supply voltage(est 10A) the drop ends in the high 3V range. However if you only send 1 amp it’s 4.88v at the end.
They use these modules for long runs of permanent christmas lighting up to 800 led’s per module. Rob the hook up and dr zzz’s have a lot of youtube video’s that really go in depth.
