If you're referring to the effect on DCS signaling, then you don't need the inductor. The problem for LED lighting is you will see flicker. Incandescent bulbs kind-of sort-of demote the flicker effect since there's a filament time-constant where the bulb brightness decays (albeit quickly) when voltage is removed. The common wisdom has been that since the inductor cost is negligible relative to the effort to open up a car, re-wire, add LEDs, etc., why not just throw in the inductor even if you don't use DCS today.
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