I have a Hella conversion running CATZ jap spec H4s. 170w/210w. their not subpose to look blue they are coated with an atomized layer of Blue Iridium their FILTERING light not making it blue... the PIAA super white bulbs are the clearest H4s you can buy.. Have those in my Alfa, I love em! kinda pricey though... $118 from NOPI for the pair.
www.nopi.com if you WANT a BLUE light call nopi and order a pair of MR16B ($10 each) with a set of Pilot PL2020G those are blue.. 80 watt they are a GOLD Iridium bulb AND lense! Filtering the gold/yellow out of light leave ... yep.. Blue!