I was wondering where i can find brighter blue lights. I have read some threads and see a couple of pictures where peoples lights are bright blue.

Also, can the s2k's lights be put in a E320?

 

Higher color temp(more bluish) of xenon bulb outputs less lumen.
Stock(around 4250k) color temp will be brightest..and if you get more bluish bulb(6000k or 8000k or even 10000k) it will get darker and daker.
Higher temp xenon tends to give impression that it's bright due to more blueish light but the reaility it isnt..(considering we are using 30watt ballast...it's totally different story with 50 watt ballast tho)

 

our lights are plenty bright as is IMO