@Train Nut posted:A dedicated variable transformer.
@EJC-1956 posted:It will just to satisfy a personal preference....if i want street lights brighter I will make them brighter...just looking for additional flexibility
i would imagine that there will be at least 5 circuits requiring independent control
ultimately i would just like some dial i could turn to control the brightness
I think the first response was your answer. Depending on the load for each, a collection of very small (probably available inexpensively) transformers for each one, or if your power needs warrant it, a Z(or V) or ZW (or VW) (slightly more expensive, but also more capability in a smaller footprint than 4 separate units) with 4 adjustments per unit.
I'd recommend Z/V since you don't need whistle or direction controllers for your application.
-Dave