The description of a 100W Street Light Lens typically focuses on its material, optical properties, mechanical features, and intended application. Here is a textual description covering the main aspects:
💡 Material and Construction
The lens is usually made from high-transparency optical-grade polycarbonate (PC) or sometimes tempered glass.
* Polycarbonate is favored for its light weight, high impact resistance (Vandalism/IK rating), and UV resistance to prevent yellowing over time.
* Glass offers superior scratch resistance and very high light transmission but is heavier and more brittle.
The lens housing or bezel, if integrated, is typically made of die-cast aluminum for effective heat dissipation (acting as a secondary heatsink) and structural rigidity, often with an IP66 or higher ingress protection rating for weatherproofing.
✨ Optical Performance
The primary function is to precisely distribute the light emitted by the underlying LED array.
* Light Distribution Pattern: It is engineered to achieve a specific photometric distribution, most commonly Type II or Type III (for roadways), which means the light is concentrated forward and slightly to the sides, minimizing light trespass onto adjacent properties (back light) and reducing upward light pollution (uplight/ULOR = 0%).
* Efficiency: High optical efficiency (often over 90% transmission) is crucial to maximize the usable light output (lumens per watt) from the fixture.
* Refraction/Reflector: The lens surface is often prismatic or refractive, meaning it has molded patterns (ridges, lenses, or beads) on its surface. These features work in conjunction with internal reflectors to control the beam angle precisely.
* Glare Control (UGR/Rating): The design aims to keep the Unified Glare Rating (UGR) low for driver comfort and safety.
📐 Physical and Mechanical Specifications
* Form Factor: The lens shape is generally rectangular or square to match the layout of the LED chips beneath, though circular lenses are also used for round fixtures.
* Sealing: It must have a robust gasket or silicone sealant around its perimeter to ensure a tight seal against moisture and dust ingress.
* Mounting: Features include specific snap-fit tabs, screw holes, or retaining clips that interface securely with the main body (fixture housing).
🎯 Application Context
This specific 100W lens is designed to effectively illuminate an area where a medium-power LED array is used, typically suitable for:
* Residential streets (lower speed roads).
* Collector roads.
* Parking lots or pathways requiring a controlled, medium-throw light distribution.
