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XC90 '02–'15 General Forum for the P2-platform XC90 model |
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Bi-Xenon headlamp queryViews : 456 Replies : 5Users Viewing This Thread : |
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Sep 6th, 2018, 21:27 | #1 |
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Bi-Xenon headlamp query
Hi,
I have had my xc90 for a few months and have just noticed a headlamp quirk. When I have the lights on main, or dip, and I switch to the other setting, the lights have increased brightness for a second or so before dimming back down to the level they were at before switching over. This happens when I go either way. Does anyone else notice this?, is it usual behaviour? Thanks. |
Sep 6th, 2018, 22:33 | #2 |
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Probably the ballast firing up the bulb again when it's ready hot ?.
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Sep 7th, 2018, 07:58 | #3 |
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Last Online: Oct 4th, 2023 13:56
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Hi,
iti is normal, all of the other cars i owned with Xenon lights did the same. Turn on, increasing the light to max and then dimming back a bit. Best regards. |
Sep 7th, 2018, 09:15 | #4 |
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yes that is because they use several 1000 volts to fire up the lamp then after a second or two it reverts to 80 volts to keep it lit ..
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Sep 7th, 2018, 10:48 | #5 |
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Sometimes, when the bulb is getting a bit old and tired it may not fire up the first time when switched on. That will produce the Bulb Failure message. Switching OFF and ON again will give it a second chance.
Also when switching ON, the bulb may flicker for a second or two as it settles down. This almost cause a collision for me in a supermarket car park. The daylight running lights (headlights) come on after engine start. I started, then set off out of my parking spot but the guy opposite interpreted the flickering as me flashing him out ahead of me and we almost met in the middle.
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Sep 7th, 2018, 19:50 | #6 |
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Last Online: Sep 7th, 2018 19:50
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Thanks for the help with this, I guess I can stop wondering about that one. I now not only know that it is normal, thanks JADXC, but why it happens, thanks Clan.
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