Why silicone lens LED get aged yellow with uv light?
Silicone lenses used with LED lights can also become yellowed or discolored when exposed to ultraviolet (UV) light for similar reasons as mentioned in the previous response. Here's why silicone lenses for LED lights can age and turn yellow due to UV exposure:
UV-induced chemical reactions: UV light can initiate chemical reactions in silicone materials. This is true for both silicone lenses used in LED lights and other silicone products. Exposure to UV radiation can break down the chemical bonds in silicone, causing changes in its molecular structure that result in a yellowed or discolored appearance.
Photodegradation: UV radiation can lead to photodegradation of silicone materials. This process involves the breaking of molecular bonds and the formation of new chemical groups in response to UV exposure. Over time, this can alter the optical properties of the silicone lens and make it appear yellow.
Formation of chromophores: UV light exposure can lead to the formation of chromophores in silicone. Chromophores are chemical groups that absorb light in the visible spectrum, which can cause a material to appear discolored or yellowed. The specific chromophores that form in silicone lenses due to UV exposure can vary depending on the silicone's composition and the conditions of exposure.
Environmental factors: The degree to which silicone lenses for LED lights yellow due to UV exposure can depend on various environmental factors, including the intensity and duration of UV exposure, the wavelength of the UV light emitted by the LED, and the presence of other substances or contaminants in the environment.
To mitigate yellowing and aging of silicone lenses used with LED lights, it's essential to consider the following:
Use UV-resistant materials: Choose silicone materials with UV-resistant properties or coatings specifically designed for use with LED lights. These materials are less prone to yellowing and degradation when exposed to UV radiation.
Quality control: Ensure that the silicone lenses used with LED lights meet quality and performance standards. High-quality lenses and coatings are less likely to degrade quickly.
Protective coatings: Apply protective coatings on the silicone lenses to block or absorb UV radiation. These coatings can help prolong the lens's optical clarity and appearance.
Controlled environments: If possible, consider using LED lights and silicone lenses in controlled environments with reduced UV exposure.
By using glass lens packed UV smd leds, you will have no such headache problem about the impact of UV-induced yellowing and aging.
