I just purchased a 2018 GLS 450. I test drove during the day and figured it would automatically come with XENON. My previous Volvo and Infiniti and even my 2001 BMW all had XENON lights. These halogen lights are too dim and very dangerous. This is my first MB and so far not pleased with it. The dealer is telling me that the lights CANNOT be replaced/ changed. I am scared to buy one of these aftermarket lights and have it not work. Are you 100% positive that they do work? Did you have a mechanic replace them? Please help.