There are a few iconic lightbars that defined eras and technologies. When I think of sealed beam tech Twinsonics ruled. They dominated the 70s and first half of the 80s. They also get credit of being the first fully enclosed multi-beacon powered crossbar. Going into rotators you have the iconic Aerodynic, possibly the greatest looking lightbar of all time and a cult classic in pop culture. While Federal was the first into duel level bars with the Streethawk they got spanked in every category by the MX7000. Whelen pioneered the aluminum I-beam construction and directional flash philosophy most lightbar of the modern era are built by with the Edge series in the 80s, which was the era strobe technology came of it's own and gave Whelen the head start of already having the perfect platform for LED. With that I would have to say those are the four most prolific and greatest ever lightbars of all time. So for me the Federal Twinsonic, Aerodynic, Code 3 MX7000 and Whelen Edge 9000 are the Mount Rushmore of emergency lighting. For me Federal twin beacon rays, Whelen crossbars and Delta's get an honorable mention b/c how good they could be if set up right but factors prevented them from reaching startum.