I bought the H4 blue colored ones forget what they were I think 6000K. They are bright as can be, but like CRSMP5 said it is a different bright. It was when I changed to 7" rounds. I think the change to rounds was amazing in itself as I already had the aeros relayed and knew that difference. I am too cheap to buy more bulbs but I think my next ones will be a more white light. For me the black top driving is the killer. There are a ton of back roads but since I have grown up, got saved, and don't drink and drive anymore I don't drive the back roads at night really at all anymore. I do like the fact I can see deer coming from off the road way out. It is the brand new black top that just sucks so bad. You can't really see the road you just see everything else. The signs are lit up about 3/4 of a mile down the road if it is flat with brights, but the road is no brighter 10 feet in front of you than it is 100 feet.
...BTW your Bieber avatar is awesome.-Malone
You guys are wrong about running both filaments in an H4 bulb. I have been doing it for years and never have seen a problem. I just see more of the road. Some lighting sites also recommend it.
Probably just holds the high beam stalk in the limbo between low and high beam.