H15 is a dual filament bulb. It is used for the high beams (2013-2017 Mercedes GLA and 2010 Volkswagen Wagon with OEM halogen bulbs). There are 4 options for those of you who would like to upgrade the lights. We offer Single beam kits and Low Xenon/DRL Halogen in 35W and 55W options. Daytime Running Lights increase the safety while you are on the road. They give an opportunity to other drivers to see you on the road. H15 HID lights are much brighter than halogen bulbs. Even with the 35W HID kit, you will definitely increase the night vision. Make your car looking luxury during the day and safe during the nighttime.