any bulb with colour temperature more than 5000k will suffer when raining.
Be it xenon HID or halogen bulb, PIAA or philips....
If u wanna see clearly in the rain, get spotlight with 3XXXK color temperature bulb.
Don't rely on those white bulbs.... wat brand also can't help u if the color temperature is not right for the road condition.
It doesn't mean u buy an expensive PIAA "NORMAL HALOGEN BULB", then u will be able to see thru the rain with your expensive white bulb. dream on....Even HID that cost 3 times the price also can't see thru rain....
unless its 4300k larr...
even stock bulb give better road visibility than those expensive PIAA halogen bulbs...
Anyway, bluish white light is nice but in exchange of diminished road visibility... Its a matter of Give or take.