It's only illegal if you get caught but yes, forward facing red or blue lights is illegal as those are reserved for safety personnel (police, ems). However, if you're not driving with them on, it's fine. I have a lot of lights on mine that if I drove with them on, I'd probably get my car impounded LOL but I have them just for show.
Deen, Thanks. I see too many driving with red / blue lights and "off road" (AKA: Too bright for oncoming traffic). It's just not legal unless you fall into the "Emergency" category. Then it needs to be with the siren sounding
BTW: I added more lists to the back of mine and tomorrow I'll add more on the front. More pictures coming when I'm done.