Late Model oem HID Main Beams - How do they work ?

[macspring]

Was just wondering about the above, as on my cheap aftermarket HIDs my dipped beams take a while to warm up and get to full brightness - which is fine and they work fine for dipped beam headlights.

But I was wondering how does a new and expensive car's main beam with oem HIDs work. i.e. flash brightly in an instant ?

Thanks.

[rynaqui]

They take a while to warm up on the other cars we have as well.

[Ross]

I'm pretty sure they just refocus the beam, move the bulb of reflector or something, rather than an additional bulb. I would love HID beams in the RS2!

[martinjs]

Yes they use 1 bulb iirc

[macspring]

I am thinking of a car with separate dip and main beam headlights that flashes to let you out during the day ?

i.e. their headlights were off.

[mcandmar]

Thats not why they are flashing you David

[Fat Audi 80]

Bi xenon's have a moveable flap that opens or click closes for dipped or high beam. It is not recommended to switch them on and off....