H15 is an unusual bulb style used by only a few automotive manufacturers including VW, Ford, Audi, and Mazda. H15 bulbs serve a dual function as a high beam and DRL bulb. Some of the cars that use H15 bulbs are VW Golf, Audi A3/A5, Mazda 3, Mercedes Benz C and S Class, and Ford Ranger.
The new H15 V12X Series LED kits are 6V DRL compatible and product 12000lm of brightness per kit. Each bulb is 25W, it is fan-less, wireless, and fits exactly the same as its halogen counterpart. V12X series H15 is truly plug-n-play.