This is the 5th Generation HID ballast: designed specifically to integrate with the complex computer systems found in modern vehicles. PWM Integration: PWM stands for Pulse Width Modulation, it's when the vehicle flashes the input voltage to your bulbs so fast that you can't see the difference, but it modulates the activity of the halogen bulb. That's fine on an old style halogen/incandescent, but on HID systems it might make a flashing or strobing effect, or not work at all.
GTR Lighting GTR.BL030 35W / Amp: GTR Ultra Slim HID Ballast
Xenon Depot LED Bulb, H4 Xtreme LED Pro, Universal Upgrade for Forward Lighting, High/Low Functions, Pure White, Fanless, Ultra Bright, Plug and Play Replacement with Adjustable Collar (1x XD.LED050)
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If looking to switch the headlights to LED for 2011-2018 VW Jetta, do not miss this custom LED H7 light bulb- Pro series MB1. LASFIT MB1 brightest LED headlight bulbs are truly the best LED headlight kits on the market for 2011-2018 VW Jetta. LASFIT only produces and sells the best and bright H7 LED Kits-Pro Series MB1.
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GTR Lighting PWM Interface Modules GTR.H103