Sorry, but the light output on Ultras is less than regular Silverstars. I know because when I was working at Autozone, a coworker blew one of his silverstars and decided to replace it with an Ultra, the older silverstar was noticeably brighter than the brand new "brighter" Ultra. Plus I hate to break your bubble, but Silverstars are no brighter than regular standard Halogen bulbs, they just have that stupid blue tint that's useless in the rain, fog, or worse a snow storm.
