Optical Performance, Aging, and Impact Resistance Compared

In outdoor solar lighting, the choice of lens material significantly affects optical clarity, durability, and long-term performance. Glass and polycarbonate (PC) are the two most common options, each with distinct trade-offs.

Optical clarity and light transmission

Glass typically offers higher initial optical clarity and more stable light transmission over time. Its surface resists micro-scratching, helping maintain beam definition and uniformity.

PC lenses provide good initial transmission but are more susceptible to surface wear, which can scatter light and reduce optical efficiency over extended use.

Impact resistance and safety

PC lenses excel in impact resistance. They are less likely to shatter under mechanical stress, making them suitable for vandal-prone or high-impact environments.

Glass lenses, while harder, can fracture under strong impact. Tempered or reinforced glass improves safety but does not eliminate breakage risk entirely.

UV exposure and aging

Prolonged UV exposure affects both materials differently:

         Glass: largely UV-stable with minimal yellowing

        PC: may yellow or haze over time without proper UV stabilization

Aging-related optical degradation is often gradual and overlooked during short-term testing.

Environmental suitability

Lens selection should consider exposure risks, maintenance access, and optical stability requirements rather than initial appearance alone.

Engineering takeaway

Glass favors long-term optical stability.
PC favors impact resistance and safety.