2005 Mercedes Benz CLK 320 Technical Service Bulletin # S-82_10-680 Date: 090518

Lighting - Xenon Headlamp Brightness Explanation
Date: May 18, 2009
Order No.: S-B-82.10/680
Group: 82
SUBJECT:
All Models 140, 163, 164, 170, 171, 202, 203, 204, 208, 209, 210, 211, 215, 216, 219, 220, 221, 230, and 251 Equipped with Xenon Headlamps
Headlamp Color and/or Brightness Difference When Changing Xenon Bulb
You may receive customer reports regarding the above model vehicles after replacing one xenon bulb. Headlamps will have a visible color
difference between the two when only one bulb is replaced.
Explain to the customer that in situations where only one bulb is replaced:
^ There is a perceptible color difference for the first 100 hours when comparing new bulbs with those that have been in service for some time.
^ Once this "breaking-in period" has passed, the color becomes bluer and resembles that of the older bulb.