California Law Regarding Underbody Light Kits On Any Vehicle?

I just got a million color LED underbody light kit for my truck. Im in California bay area (San francisco / Oakland Hercules) Where can i find the law stating whether it's legal or illegal to have the lights on while driving, or at all? Im looking for the code, website, or anything where i can print, or... show more I just got a million color LED underbody light kit for my truck.

Im in California bay area (San francisco / Oakland Hercules)

Where can i find the law stating whether it's legal or illegal to have the lights on while driving, or at all?
Im looking for the code, website, or anything where i can print, or show from a reliable source.

Thank you!
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