Easily the best D1S bulbs to ever hit the market, it's no wonder auto makers such as Mercedes and BMW are starting to spec the D1S CBI in their flagships such as the new F10 5 series and S65. Indeed they are the "Rolls Royce" of D1S Lamps. What makes them so amazing? Osram's Cool Blue Intense bulbs offer more lumens than the once industry-standard Philips 85122+ 4300K bulb, but with a higher Kelvin rating of up to 6000K. So what? Meaning they are physically brighter and offer more contrast at night, which makes them seem even brighter than they already are. In summary, everybody who uses them agrees they're the best D1S bulbs ever made.