Blue light is crappy for long distance driving, it tires your eyes quicker. It doesn't light signs better than white HID light. The blue just doesn't light everything around the sigh as brightly as the white, thereforce it just stands out more than a white HID.
yellow will kick those hyperwhite or ultra white's butts.:lol: And remember this, those hid wanna be will never better than your stock halogen. It looks brighter when you're look at it, but the lumens output is less than stock halogen.