Several common materials used for high-power LED lenses include PC, PMMA, silicone, and glass; these are described below.
1. High-Power LED Chip PC Lens:
Optical-grade polycarbonate (PC) is a plastic material characterized by high production efficiency, manufactured via injection molding and extrusion. It offers advantages such as light weight, drop resistance, and low cost, with a transmittance of approximately 89% at a thickness of 3 mm. However, this material has limited thermal stability, with a maximum operating temperature of 110°C and a heat deflection temperature of 135°C. Currently, it is widely used in LED lenses where optical transmittance requirements are relatively modest.
II. High-Power LED Lamp Bead Silicone Lens:
Silica gel (Silica
gel;
Silica, also known as silica gel, is a highly active adsorbent material and an amorphous substance. Thanks to its excellent thermal stability—allowing it to withstand reflow soldering—it is commonly used for direct encapsulation on LED chips. Typically, silica‑gel lenses are small, with diameters ranging from 3 to 10 mm. As product size increases, manufacturing costs rise; consequently, beyond LED chip packaging, its applications are relatively limited.
III. High-Power LED Lamp Bead Glass Lens:
Optical glass materials boast key advantages such as a transmittance of up to 97% and excellent thermal stability; however, they also face challenges including limited design versatility, fragility, difficulties in achieving large‑scale production, low manufacturing efficiency, and relatively high costs. Although a handful of domestic manufacturers have begun developing glass molding processes—using molds for melt‑casting to produce lenses with diverse shapes and specialized surface features—such equipment remains prohibitively expensive, making widespread adoption unlikely in the near term. Moreover, the inherent brittleness of glass continues to pose a significant challenge that requires further research and resolution. Due to their high transmittance and higher cost, glass lenses are typically employed in precision optical instruments.
IV. PMMA Lens for High-Power LED Chips:
PMMA originates from the English term “acrylic” (acrylic plastic) and is chemically known as polymethyl methacrylate. Commonly referred to as “organic glass,” it is often called “acrylic” in Hong Kong and Taiwan. This material is one of the earliest developed, important thermoplastic polymers, boasting excellent transparency and chemical stability. As a type of plastic, PMMA shares many properties with polycarbonate (PC), including ease of molding, high production efficiency, light weight, and impact resistance. It also exhibits a high light transmittance—around 93% at a thickness of 3 mm. However, its drawbacks include a maximum operating temperature of 85°C and a heat deflection temperature of 92°C. Thanks to its superior light transmission, cost-effectiveness in mass production, and relatively low price, PMMA is widely used in a variety of optical lenses.
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