I've been riding with a yellow H4 bulb on my bike for years in Belgium when I lived there and it has just passed it's certificate of roadworthyness (MOT) in the UK with the same bulb. I don't know about the technical idea of better or worse lighting but I like that it is a different colour from all the other headlights so at night in traffic, my single yellow headlamp is different and might just get noticed against all the other white headlights.
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