You are asking a legal question….. the clear or smoke should not be a issue…..what does your STATE require for the color of the bulb…Most if not all require yellow in the front and red in the back…if the back is yellow it can only be for the turn and NOT a turn/brake combo…. just sayin...

I have gone with clear as the front of my bike is clear...if using a dark shield then a smoke lens would match....

I believe there is a bulb that looks clear, but lights up yellow....