Well... I know you are about to get blasted for the legality of this... I assume you know that it is VERY illegal to do this, so if you decide to, just dont get seen/caught by anyone who doesnt think its funny. Especially cops.
BUT... I have an amber lightbar (for use on the local Base) and 2 red LED lights for when I am enroute to FD calls. I will try to get pics/video of it going. I would like to improve on what I have, but it is a bit cost prohibitive, which leads me to ask you this:
Do you have any idea how much it all costs? A siren+speaker alone is going to run you $200-250 and the lighting can run you anywhere from $50 for something small and cheap all the way up to $2000. Are you really prepared to drop that kind of cash for some scaring your friends? Not to mention it will land you in jail if you EVER get caught.
Moral to the story: If you are not authorized vehicle lights, dont get them. They pose a VERY high risk to you AND those around you.
Did you know that (at least in TX) if you are running vehicle lights and ANYONE around you gets in a wreck it is YOUR fault??!! And, even if you are NOT running the lights, if you get in any kind of wreck and the other person sees that you have them (again, even if they are off), it is your fault.
Do you still want vehicle lights? Go to
www.galls.com. I cant remember if they require a Chief's authorization, though. Do some Google searches, and you will come up with some good places.
FWIW-- I am a volunteer FF/EMT/NASAR type II. I have been doing POV response to the station for about a year now, and have experience with 3 fire departments (I haven been at one for the whole time, one simultaneously for a shorter while to help out, and am trying to switch over to another now.) Not to say that I am the expert, but I have seen a LOT of problems due to this sort of thing (even when the lights were authorized but being used inappropriately)
Be safe.