After completing Stage 30 of this partwork build, I took a swing at rebuilding the roof Lightbars (they have been bugging me due the limited amount of light they put out). Turns out the stock model uses tiny red SMD LEDs on a PCB that shine up through clear LED-shaped domes.
I ripped all that out and used diffused 3mm round LEDs in red and white instead. These new LEDs had their domes sanded flat and have been wired with an alternating strobe pattern so the clear center Lightbar takes on the appearance of a Opticom-type traffic-signal triggering light found on many fire trucks.
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