When I get caught out at night which happens to me a lot. My lights do not seem very bright & I don't use low beams as I can not see any thing on low beam. So on the way home in the dark tonight I stopped by a parts store. I knew she takes an H4 & they had the Sylvania Silverstar ultra, the brightest legal bulb in the store on sale. My light is a lot brighter now. Think about 1 AM I will take her out on the road & see just how much brighter it is. It is almost 10:30 & here in Memphis it is 62 feels like 64 so it should be a real nice ride.