well, the fire trucks lights are on the roof but since the design of the truck does not allow a full 360º view, the have additional lights that allow for that. With the ambulance, I would have to say they are saying for all practical effects, the lights are as if they were on the roof. Again, due to the construction of the vehicle, the lights are not visible in a 360º view and as such, they have added lights to remedy that.
You are wanting lights inside the vehicle.
That is what I believe is the problem you are facing.
the problem I see is unless the interior lights are sealed against the window, they will reflect off the window. If the windows are foggy or frosted (on the inside) the effect is even greater. As such, I would see the interior lights as causing an unsafe situation.
I'll agree with that but again, the lights you are looking at do not provide a 180º view even. Your lights would not be visible from the side, especially if a vehicle were directly to your side. They would not be able to see any direct light from your type of lights, only reflected, at best.It doesn't state the 360 degree output has to specifically be from one light.

