Lighting - Dew Formation Inside Exterior Lamps

NUMBER: 07-59-07
DATE: 12/17/07

APPLICABILITY:
All Current Models

SUBJECT:
Dew Formation Inside Exterior Lamps

Introduction

This bulletin is for information purposes only. Due to the recent design change of the headlamps and rear combination lamps, dew formation may be visible on the inside of the lamps. The dew formation is temporary and will disappear when the temperature rises or when the lights are turned on for a while. Replacement of the headlamps and/or rear combination lamps for dew formation is not a matter for warranty.

Dew Formation

This is most noticeable in the late fall and early spring. This condition occurs when there is a difference in the temperature between the evening and morning or when washing a vehicle with cold water on a warm day when the lamps are warm. This is the same symptom as dew formation on the surface of window glass.

Examples





1) If a lamp is unevenly warmed by sunshine, the temperature of the area where the sun shines is about 50° F higher than the other area. When air circulates inside the lamp, the warm air reacts to the cold surface, and dew appears.





2) If a lamp is cooled down rapidly (as when you apply water to the lens during washing), a severe temperature difference will occur, and dew formation will result.





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