Downlights used in wet locations are generally sealed to an IP65 rating. This degree of ingress protection allows the luminaire to resist penetration of airborne particulates as well as strong water jets and moisture ingress. High watertight integrity is of particular importance for LED lighting systems. Integrated LED downlights incorporate LEDs and sometimes driver circuits into its enclosures. The entry of moist air into the luminaire may cause condensation to form, which can lead to a short circuit or other electrical failure of the luminaire. Long-term exposure to high condensing moisture can lead to moisture penetration through the plastic packaging materials of LEDs, which can reduce interfacial adhesion strength and form cracks in silicone encapsulants. In this case, significant lumen depreciation and color shifts are anticipated.

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