Real shame about the H13. Optically it's cleaner than its predecessor the 9007, but it could've been so much better, and it would've been, if Ford and Sylvania hadn't done their usual "we Americans obviously have all the best ideas and those dumb Europeans are wrong again" dance routine. H13 was supposed to be a new international double-filament bulb suitable for producing good ECE or SAE headlamps. The design the Europeans brought to the table would easily have accomplished that and been a really comprehensive improvement over every previous double-filament headlamp light source worldwide. But, as usual, we got stuck with the Ford/Sylvania design. This is how we got the 9004 bulb in 1983 and the low-wattage halogen sealed beam in 1979, too, as well as low-durability plastic headlamp lenses and half a dozen other "innovations" in automotive lighting that benefit only the automakers' bottom line. The H13 is approved worldwide, but the Europeans won't touch it because while you can make an ECE beam with it, you can't make a very good one. There are other problems with H13, but that's not what this thread is really about, so I'll close here.
