This application brief details the optical characteristics and optical model creation for Lumileds SuperFlux LEDs. In addition, simple techniques to aid in the design of collimating reflectors, collimating lenses, and pillow lenses are discussed.
The document describes the optical characteristics of SuperFlux LEDs, including light output, radiation patterns, and the definition of key parameters such as full‑width half‑max (2θ1/2) and total included angle. It also presents point‑source and detailed optical models that help designers predict LED behavior when secondary optics are placed close to the device.
Practical design tools for secondary optics are provided, covering pillow lenses, reflector cavities, and collimating lenses such as Fresnel and dual‑convex lenses. Design case studies for CHMSL applications illustrate how to select lens geometry and size to meet photometric specifications. The note also references rayset files that Lumileds can supply for more accurate modeling.
| Full‑width half‑max (2θ1/2) | ≈ 90° |
|---|---|
| Total included angle (θv0.9) | ≈ 95° |
| Point source position Z for HPWA‑Mx00 | 1.03 mm |
| Point source position Z for HPWA‑Dx00 | 1.13 mm |
Secondary optics are optical elements placed outside the LED package, such as reflector cavities, Fresnel lenses, and pillow lenses, used to shape the LED’s output beam.
For the HPWA‑Mx00 SuperFlux LED, the full‑width half‑max (2θ1/2) is about 90 degrees.
The total included angle is roughly 95 degrees, meaning 90% of the flux is emitted within a 95° cone.