GRG
I'm about to install LED reel strip lighting in several O scale 2 rail passenger cars. One of Gun Runner John's LED regulators will be used to drive an 18 LED lighting strip. The railroad is DCC powered with a nominal 16V square wave AC on the rails. I'd like to dim the lights further than the regulators can achieve with its on board potentiometer. In a workbench test I found a by connecting a 1300 ohm resistor between the regulator and the track power I can get the intensity I want.
Question: Is there a preference whether the added resistance is upstream or downstream of the regulator?