I had a friend in Lubbock who had bought a TwinSonic that came with red domes. He ran a service that did roadside assistance and couldn't have red to the front but could have red to the rear. Blue or amber forward was o.k., so he got a blue dome and took it and the red dome to a plastics manufacturer in Lubbock and they were able to cut both domes and put them back together with blue to the front and red to the rear. Seems like they used some kind of clear silicone in the process.
I never really thought about it, but that was probably the shortcoming of the Twinsonic and similar lightbars. The inability to show one color to the front and another color to the rear. Federal certainly addressed that problem with the Aerodynic and Jetsonic series.
Dominion Automotive made them specifically for the Ontario Ministry of Transportation Highway Patrol units. Those units were non law enforcement, and patrolled the major 400 series highways in the Toronto / Niagara Corridor. They assisted at MVC's, provided traffic control and first aid, and assisted disabled motorists. And I guess I will have to post a picture of the NOS one I have. Ben
Awesome grab for $15!!! There was a thread or post on here that someone discussed a plastic specific adhesive that did not leave residue. I will try to find it. I believe Rob was the one talking about it.
Digging around, I found some pictures of a few of these for the FB3's from inventory photos. They were produced to comply with our state laws requiring red to the driver's side and blue to the passenger side on LE vehicles. These would have been a necessity when using the UF7 flash mirror assembly to meet this statutory requirement versus the front/rear red/blue split which produced a smorgasbord of red/blue flashes...
And an FB4, dual speed, utilizing one of those split filters;
That reminds me of an ambulance I used to see as a little kid. It was a '51 Chevy sedan-delivery. It had two clear driving lights mounted on the front corners of the roof which were painted red. The only "real" red light on the ambulance was the spinning PropelloRay light on the fender-mounted siren. It belonged to Ellis Funeral Home here originally, and when it was replaced by a '54 Ford wagon, the Chevy was given to the predominantly black funeral home. Something you'd like, Dan, a red BR2 was added to the rear roof, but the nice big siren/light was replaced with a tiny Federal VL siren. The guy just couldn't understand why people weren't seeing and hearing him!
I got the other one. Nice light. I trashed the box. Smelled. Light is gorgeous. It shows they had blue red and blue amber options. Wonder if those had actual split domes. This one is red sprayed. Looks brand new