When I turn on my xenons there is a flash as they come on, is this normal? Or are they supposed to come on and stay the same intensity?

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Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K

Well, mine don't flash. They come on and slowly brighten over about 15-20 seconds.

Sounds like some voltage issue or maybe a bulb is getting ready to fail.

That's normal depending on the transformer.

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My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much)

Wife's - '08 Saab Sportcombi Aero

Riding a '03 Yamaha Warrior

You are seeing the result of the "ignitor" bringing your headlight to life.

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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This is why all cars with HIDs have halogen lights for flashers (I don't mean turn signals).

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles

HIDs use ballast resistors, similar to flourescent lights...so the turn-on behavior is also similar.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car