When I got on hired at the PD in 1988, we had the S&W bars like the catalog. Some had rectangular bulbs for flashers and some had PAR 36s. No alley lights. All red. Then we tried 1 Jet sonic in red. Then Streethawks w/ speaker grills red/blue with dual takedown lights in lower. They flashed with the alley lights in position 3, then all light street hawks, then MX7000, then 1 Tomar Neobe strobe bar, Whelen Patriot with 8 strobes and 6 7mm LEDs and halogen TD/ AL, then Whelen Liberty and finally 1st gen FS Valor bars in dual color red/blue. Wonder what they will go with next change over.