What lighting is used for rest areas owned by your state's DOT? For me, Holophane Crestwoods, and a bunch of other shoebox and mushroom-type post tops were used for WSDOT's rest areas. A few cobraheads were used here and there. I'd assume they were all HPS. But the LED changeover started in 2017. AEL Autobahn ATBMs started replacing the post tops and the cobraheads. Do you know how they converted the old post tops to LED cobraheads? They simply installed an adaptor. I will show you an example. This is at WSDOT's Sprague Lake Rest Area out near Spokane. Here's what it was
before (Holophane Crestwood). Here it is
now (AEL Autobahn ATBM).