One D4S 35W Philips 42402 OEM 43K 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.