I would like to upgrade the bulb in my LX's headlight without doing a HID installation. Who sells the brightest bulb and what is the most ideal degree of kelvin? 4000k, 8000k?

This is what I have found so far. I'm not sure how much an improvement there be with these bulbs.

XENON Twin Plasma Headlight Bulb
http://www.scooterwest.com/item_detail/XENON-Twin-Plasma-Headlight-Bulb/820/
PIAA INTENSE WHITE H4 60/55W=135/125W XTRA TWIN PACK
http://autosupermart.com/store/shop/piaa10904.html

Any suggestions?