You don't want to see the tubes. This presses legal issues. Supposedly (don't hold me to this), colored lights on your car are street legal as long as the light is red, amber, or white. An underbody light SHOULD be street legal as long as you can't see the light itself. That is, it could be any color of the rainbow as long as you didn't see the light itself. Ambient light cast of the road shouldn't be an issue. This isn't to say that cops won't stop you, however.
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