FACT: MOISTURE IS NOT WATER LEAKING!!!

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Cause of Moisture on the Internal Side of Lens

1. Temperature difference between the internal side of lens (cooler) and the internal of the lamp (hotter).
2. Humidity of the internal of the lamp has to exceed a certain level

Formation of Moisture on the Internal Side of Lens

1. When the lamp turned on, temperature inside the lamp would increase and moisture absorbed by the lamp material would be released. This would make hot and humid air inside the lamp.
2. Cold weather or other reason decrease the temperature of the lens.
3. Once the hot and humid air inside the lamp touches the cooler lens, the hot and humid air would turn into moisture on the internal side of lens.

Remark:
After newly installed lamp turned on for the first time, there might be moisture on the internal side of lens for 1-3 days, depending on the owner's location. This is a normal phenomenon and it should be over after the moisture is released. If the phenomenon continues, then fitness of the lamp should be checked to make sure no extra moisture would enter the internal of the lamp (e.g. the sockets and the covers).