I would swap sides to confirm if it's the bulb or something in the headlight assembly or ballast. Ignitor I think you mean ballast which controls the current going though the arc.

You could have a focus issue if a lamp is built wrong and has the arc not at the focus or you could have haze on the reflector or the lense.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)