LED Street Light & Signage Lens Manufacturing Guid

Custom LED optics for roadway lighting and illuminated signage — why street light lenses are selected by distribution type, while signage light box lenses are designed to conceal individual LEDs and deliver uniform illumination.

A street light lens and an illuminated signage lens both start with the same basic configuration — an array of LEDs paired with custom-molded secondary optics — but they address fundamentally different optical requirements. A street light lens shapes light into a defined photometric distribution that illuminates the roadway while controlling upward light and spill into neighboring properties. A signage lens serves a different purpose: it blends light from individual LEDs to create a uniform glow across the sign face, minimizing visible hotspots.

This guide explains the differences in precision lens design for these two applications — from IES distribution types for roadway optics to batwing optics that suppress hotspots in ultra-thin signage displays.

Street lighting is a standards-driven application subject to applicable lighting codes and project specifications. Here, the secondary lens must achieve the specified photometric distribution to meet applicable municipal lighting requirements, glare limits, and pole-spacing targets.

Signage and light box illumination, on the other hand, is generally driven by visual performance requirements rather than roadway photometric standards. The engineering goal is visual uniformity: achieving consistent brightness across the sign face while minimizing visible LED hotspots.

The Illuminating Engineering Society (IES) classifies roadway and area lighting distributions into five commonly used types. Custom street light optic manufacturing focuses on designing and machining mold cavities to achieve the required photometric distribution:

Beam angle is another critical design parameter: • Narrow Beams (15°–40°): Ideal for high-mast, long-throw highway fixtures. • Medium Beams (40°–80°): Standard for general municipal roadway illumination. • Wide Beams (80°–120°): Maximizes area coverage for parking lots and open plazas.

Pole height and fixture spacing must be considered alongside the selected IES distribution type. For example, Type II luminaires may be mounted at 15–25 feet, with pole spacing planned at roughly 3 to 4 times the mounting height, depending on the roadway layout and photometric requirements.

Replacing a Type II lens with a Type III lens in a layout designed for Type II distribution can significantly alter the light pattern. This can create dark gaps between poles or excessive overlap between adjacent light distributions. In municipal projects, these issues can compromise lighting compliance and roadway safety, not just visual quality.

A thin illuminated sign or edge-lit or backlit display box places LEDs close to the diffuser face. Without sufficient mixing distance, individual LEDs can create visible hotspots instead of a smooth, continuous glow. Optical engineers address this problem using two main approaches:

• Increasing Optical Distance: Moving the LEDs farther from the diffuser. While effective, this increases housing depth and can conflict with the requirement for ultra-thin signage profiles.

• Wide-Angle (“Batwing”) Secondary Lenses: Injection molding a specialized wide-angle optic over each LED. Batwing optics redirect light toward wider lateral angles, allowing light from adjacent LEDs to overlap and blend before reaching the diffuser face — helping achieve slim light box profiles without compromising uniformity.

For commercial signage applications with strict depth constraints, custom-molded batwing lenses can provide an effective solution for improving uniformity.

1. Can you design and simulate a specific IES distribution type based on our target pole heights and spacing requirements (street lighting)?

2. Can you design and mold custom batwing lens profiles matched to our target light box depth and LED spacing (signage)?

3. What photometric simulation reports (including IES files) and physical hotspot test data can you provide before tooling fabrication?

4. Which UV-stabilized, high-transmittance, or heat-resistant resin grades do you recommend for our installation environment?

5. Do you provide production Cpk data for tracking dimensional stability, light transmission, and color consistency across high-volume production runs?

6. What ISO cleanroom class do you maintain for optical lens injection molding and packaging?

Street light lenses and signage lenses both use LEDs paired with molded optics, but their engineering requirements quickly diverge. One is designed to meet specified roadway photometric requirements, while the other is engineered to minimize visible LED hotspots across the sign face. Defining your optical performance targets at the outset — rather than selecting generic “LED lenses” — helps ensure that the finished product performs as intended in the field. If you are specifying optics for an upcoming street lighting or illuminated signage project, review the checklist in Section 08 with your tooling partner before mold fabrication begins.

ATRMOLD — Precision Optical Lens Injection Molding & Mold Manufacturing