Just wanted to share a bit of info i found while researching headlights. If you are happy with the new bulbs,
great. I tried them and wasn't happy. So i had to find out why..THIS
website has a lot of good info regarding brightness of bulbs vs color
basically what they're saying is that the color of the bulb does not reflect how bright it is. Just because a bulb puts out whiter light, does not make it actually brighter. since a lot of "performance" bulbs are actually whiter, most people assume they put out more light, when in fact they measured lumens are actually less. Kind of like shining a flash light through the tinted strip at the top of your car's windshield.. less light through tinted glass.
I was a skeptic at first so i had to try it myself and bought some sylvania silverstar ultra plus whatever bulbs.. they were whiter, but actually threw less light on the road in front of me. Maybe those bulbs are an "upgrade" if you have tired/worn out old halogen bulbs, but compared to a relatively new set of quality h7 bulbs, they are pretty dim. The only real way to get MORE light on the road is to up your wattage, or go with something more efficient, like HID's.