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I would suggest a low ohms resister in series and a capacitor in parallel
The initial resistance is quite low - but when a headlamp bulb is hot it rises to about 4.5 ohms
If I'm reading this correctly it looks like a headlamp bulb will start with a resistance of 0.45 ohms - which will build up to 4.5 ohms when it's hot
So a 1 ohm resister will take 2/3rds of the initial surge and only 20% of the voltage when hot
Or a 0.45 ohm resister will take half of the initial surge and only 10% of the voltage - which will also contribute to the life of the filament but at the cost of some brightness
The initial resistance is quite low - but when a headlamp bulb is hot it rises to about 4.5 ohms
If I'm reading this correctly it looks like a headlamp bulb will start with a resistance of 0.45 ohms - which will build up to 4.5 ohms when it's hot
So a 1 ohm resister will take 2/3rds of the initial surge and only 20% of the voltage when hot
Or a 0.45 ohm resister will take half of the initial surge and only 10% of the voltage - which will also contribute to the life of the filament but at the cost of some brightness
