Nov. 29, 2019
When it comes to LED lighting, the lens is an essential component that plays a crucial role in ensuring optimal performance. The lens is responsible for controlling the direction of light emitted by the LED, and it also helps to protect the diode from damage.
LED optical lenses are typically categorized into two types: primary lenses and secondary lenses. The former is the light source itself, while the latter is abbreviated as "lens". However, not all lenses are created equal, and the type of material used can have a significant impact on the effectiveness of the LED. Secondary lenses are commonly composed of various materials, including but not limited to: Glass, PC, PMMA, Silicone, etc. It is important to consider the material composition of the lens when selecting the appropriate one for a particular application. A professional approach to this decision-making process can ensure optimal performance and longevity of the LED lighting system.
One of the most popular materials used for LED lenses is polycarbonate (PC). Polycarbonate is a thermoplastic material that is known for its durability, impact resistance, and high optical clarity. It is also lightweight and easy to mold, making it an ideal choice for LED lenses. Polycarbonate lenses are commonly used in outdoor lighting applications, such as streetlights and floodlights.
Another material that is often used for LED lenses is acrylic, that is PMMA. PMMA is a transparent thermoplastic that is similar in appearance to glass but is much more durable. Like polycarbonate, PMMA is lightweight and easy to mold, making it a popular choice for LED lenses. PMMA lenses are commonly used in indoor lighting applications, such as office lighting and residential lighting.
However, it should be noted that the temperature resistance of this kind of plastic lens is somewhat weak and it is not recommended to operate it at a temperature exceeding 80 degrees Celsius.
In addition to PC and PMMA, glass is also sometimes used for LED lenses. Glass lenses offer excellent optical clarity and are highly resistant to scratching and damage from environmental factors. However, glass lenses are heavier and more expensive than their plastic counterparts, making them less commonly used in LED lighting applications.
Silicone lens has a multitude of impressive features. Despite its small size, it offers high UV resistance and will not yellowing over time. With a light transmittance rate of 94% to 96%, it allows for clear and bright vision. Its temperature resistance ranges from -40℃ to 200℃, making it highly adaptable to various environments. Additionally, the silicone lens is highly flexible and has low viscosity, allowing for the creation of complex shapes. Its moldable nature makes it an ideal choice for producing intricate and customized products.
Choosing the right material for an LED lens is crucial and depends on the specific application and environmental factors. The most commonly used materials are PC and PMMA due to their durability, optical clarity, and ease of molding. However, in situations where scratch resistance and environmental factors are major concerns, glass may be a better option. It's worth noting that while silicone is not as fragile as glass, it's much lighter in weight. Ultimately, the choice of material will depend on the specific needs of the application.