Originally posted by dion:
I also thought that round/circle lighting was still the best shape. Which is why you see "aero" shaped lights, but circles inside, like the BMW's and Porsche's, and the newer cars coming to market, like all the '02 Nissan's as examples.
A large round is the most efficient reflector design. A narrow rectangular reflector is the least efficient design. The absolute worst headlamp design award has to be the Dodge Intrepid. Even the lamp's designer admits its terrible, but Chrysler wanted them to be teeny.
But newer headlamp designs using axial filament bulbs (9005, 9006, 9007, H1, H4 and H7) rather than transverse filament bulbs (9004, sealed beam headlamps) can use a narrow reflector more efficiently because an axial filament bulb uses the entire reflector, not just above and below the bulb.