I've had a little experience down this road. As I understand it, yellow lenses increase contrast, and are usually used in foggy, or overcast or otherwise murky visibility conditions. Night riding with artificial lighting is contrasty on it's own....the blacks are BLACK and the Lighted areas are BRIGHT. It's not necessary to add contrast to that. Years ago the Ohio State Highway Patrol made some public service ads, one of which said they discourage the use of any colored lenses for night driving application, even yellow. I'd go with clear. Your choice, though.