Anybody know whether there are still helmets that passed the helmet tests with a peak acceleration of less than 200g, rather than the standard 300g? I have memories about reading about them, but couldn't seem to find retailers that were actually selling them.

Side note: how much more protection would a 200g helmet provide vs the standard 300g helmet?
(Let's not make this thread a debate over the virtues or lack thereof of helmets per se. Thanks.)