Well, I believe it is a simple lighting set up. However, this is not Delaware, and or Berks County. The towns around Philadelphia very urbanized, and getting to a firehouse can be difficult. Pa lighting laws are very outdated, and needs to be updated. If you see a State trooper in any of the Philadelphia suburban towns that are covered by a full time police department then a serious issue is going on. The local’s (Pd) won’t break the vollies stones, unless they have a stick up there ass for firefighters. So as far as troopers breaking the stones of the volunteer's in this area, and or enforcing the lighting rules for volunteers in the southeastern Penn region, is highly unusual. Not saying it hasn't or won't happen, but it is highly unlikely. If you talk to most the trooper's they themselves hate the lighting set-ups on their cars because people don't move for them, with a simple hlf and vector bar.
So, my closing statement is that if you don’t live in this region (Bucks, Chester, Montco, Delaware counties), and don't know what the area is like, then please do not quote the laws. The fire departments make the rules known about lighting laws, however they also they know the situation on getting to the stations for calls.