The main reason is that it makes me more noticeable. All I want is that momentary "huh, that's weird" reaction.
After getting used to it, I've found that I have a tiny bit better spatial awareness at night with the one yellow headlight. This is a little weird and hard to explain, but I think basically my visual cortex has figured out that anything illuminated with yellow light has to be illuminated by the light coming from my bike, so I have a little bit more information about exactly where everything is and how it's moving.
For example, if I catch a glimpse of a moving white blob ahead of me with normal headlights, it could be a white horse a hundred yards away and lit up by someone else's headlights, or it could be a fluffy white dog 10 yards away. If I'm on my V-Strom, the dog ten yards away would be yellow, so I know for sure it's close enough to be illuminated by my headlights.
I used this 2500K yellow bulb:
I've used one yellow bulb in my V-Strom for several years and have never had any questions or problems from the cops. I looked up the relevant laws in Indiana, and I'm in the clear.

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