One of my bulbs just burned out so I am looking at replacing them. First off all. I took a look at the H4 bulbs on PIAA's web page and found a few different ones. One burns at 5000k-low/3800k-high, two of them burn at 3800k-high and low, and one burns at 4150k-high and low. Of course every temp is a different color. Here is a link to the page.

http://www.piaa.com/glossary.html#SAE

So what color should I go with?

 

Lights are a personal preference. it's all in what you are looking for. i've got Piaa Super Plasma's and Extreme Whites. i like the Extreme's better. my friend has the Plasma Blues. the Extreme's are better than both. if you want the HID look in the lenses then go with either the Blues or Plasma's. but if you want the HID look on the ground go with the Extremes. PIAA is good with their claim that the Extremes are close to HID. they are. they burn at 55w but put out 125. they are bright as hell. the Super Plasma's have a purplish tint to them like the 2nd Gen TL's. and the Blue's, well they have a blue tint. i've got a blurry pic of the Super Plasma's. i'll get you a pic of my Extreme White's tommorrow night. any other question's don't be shy.