How to Order
You will need to check your owners hand book to see what bulbs are fitted, and what their function is, eg: H7 low beam, H1 high beam.
We will then need to know which ones you want to replace. Our suggestion is to replace low beam first.
The factory systems fitted to new cars like BMW are low beam only. A new BMW 5ser uses D2S Xenon bulb for low beam and H7 halogen for high beam ($2500 on the options list), and this is also the same if we fitted the factory Xenon kit to our Merc ($3700).
The reason they do this is that Xenon do not instantly produce full light, they need to warm up. The reason they say their cars have Bi-Xenon is that the low beam Xenon stays on when the high beam halogen is switched on.
If your car is fitted with H4 Halogen bubs, when the high beam switches on, the low beam switches off. For cars with the H4, we have a new B-Xenon H4. This has 2 Xenon lights in the same bulb. So the bulb is already warm when switching from low to high beam, and we can use Xenon for both.
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HID Xenon Lights