How do I choose headlight bulbs for my car?

I want to get a new pair of headlight bulbs for my car. Are yellow headlights street legal? What factors do I have to consider when getting headlight bulbs? How do I choose headlight bulbs for my car?Legality of different colors will depend on the state laws. It is legal here in Oregon. Yellow bulbs also emit the best light. The bluer the light the less distance the light travels.