D4R Philips 42406 OEM 4300K bulb DOT Mostly used in the automotive world today by manufacturers like Audi, Mercedes Benz, Lexus, and BMW, VW and Porche etc.. Sold individually 1 bulb. Bulbs and Ballasts are non-returnable, non-refundable, so make sure you are ordering the correct part for your car. Bulb or ballast?: see More Details. These new D4S bulbs can only work with Hella, Philips and Denso D4S/D4R ballasts only.