I don't really care what you heard. Motor vehicle laws vary from state to state. If you carefully read through the link I provided, you will see that it is very clear that under glow neons are illegal in Wisconsin. You may have "heard" that certain colors are illegal and others are fine, but that's just not true. It's a government website, so none of the information is false. Red and Blue are reserved for emergency vehicles, like I said. They will result in additional fines as a result. Any additional lights on a vehicle may be "destracting" to other drivers. This may result in an accident, according to law. I'm not necessarily agreeing with the law, but that's the reasoning. Most cops might not care, but it's possible that the person that posted this could still get a ticket. Plus, if you read the box that the neons came in, it will read "For off road use only". It says that for a reason.