Thanks Bill they just look so overkill for what i want
if you only need constant voltage there are cheaper options (look at Rapids switch mode 30A supplies), but if you want constant current (or current limit) there's no easy/cheap way to do it.

Actually, it is possible to get some current control by carefully selecting incandescent bulbs to run at their warm (low resistance)/very hot (high resistance) transition power, but it's probably not worth it these days.