Dim 20ma LED in retrofit application
You can't draw in "comments", so here is an idea circuit that might get you going in the right direction.  You can put as many LEDs in series as you need and you may have to play around with the resistor values.  Two potential problems: the pot may not be linear and you have to turn the pot in the opposite direction from where you are now to dim.







simulate this circuit &ndash; Schematic created using CircuitLab