Problem with blue lights is now a lot of police departments are starting to give out tickets for having them in your car/truck. Mississippi and Louisiana the ticket will cost you $500 PER LIGHT, and depending on the police officer and your attitude toward them they will make you take them out and BREAK them. Now if it is night and you do not have spare light bulbs they will again stop you and ticket you for no headlights at all.
All states have laws that pretty much state that blue lights are reserved for emergency vehicles ONLY. So in my book blue lights are a big no no, and will NEVER be installed in my truck.