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The illumination and lighting design workflow

Distribute a set quantity and color of light across a scene, and judge it against regulatory and standards metrics as well as by eye. What decides predictive accuracy is not the ray tracing itself but measured source data and measured scattering data.

Design challenges

Meeting the numbers for light distribution while judging appearance

Illumination design is the inverse problem of imaging. Efficiency, uniformity and chromaticity are only the entry point: for luminaires and automotive lamps, the light distribution required by regulations and standards has to be met while avoiding glare and unwanted reflections. Because the quality of the input decides the result directly, sources must be driven from measured ray files and surface and volume scattering from measured data.

Requirement | evaluation against regulatory and standards metricsThe light distribution can be evaluated item by item on the prescribed grid
Requirement | inputs based on measurementThe model is driven by source ray files and measured scattering data
Requirement | confirmation by perceptionGlare and reflections can be evaluated as luminance seen by the observer

Design and simulation workflow

From modeling the source to verifying how it looks

01

Define the targets

Settle efficiency, light distribution and surface uniformity, chromaticity, and the regulations and standards to work to.

02

Model the source

Build the source from measured ray files or light distribution data.

03

Design the optical components

Build the geometry of reflectors, lenses and light guides, and optimize it against the target distribution.

04

Assign materials and surface properties

Apply surface and volume scattering and texture from measured data.

05

Trace the system and evaluate photometrically

Trace in a 3D environment and evaluate illuminance, luminance and intensity against the regulatory and standards metrics.

06

Verification at the perceptual level

Confirm glare and unwanted reflections with rendering that includes luminance adaptation.

The stages differ by project. Simulation is an evaluation at the design stage; final conformance is decided by testing and certification of real hardware.

Related products

Products used at each step

The capabilities and coverage of each product are described on its own product page.

Lumerical FDTD

Handles analysis of the emitter. STACK and FDTD give light extraction from the multilayer structure and the fine structure.

Stage / 02

Zemax OpticStudio

Handles design and optimization of the optical components. Non-sequential ray tracing brings reflectors, lenses and light guides in line with the target distribution.

Stage / 03

Ansys Speos

Handles the application of material and scattering properties, photometric evaluation and verification of appearance. Covers scene ray tracing with measured scattering data, and human vision simulation.

Stage / 04-06

Related technical information

Related resources and solutions

Talk to us about your luminaire and target light distribution requirements

Tell us where the design stands, whether CAD exists, what measured source data you have, and the criteria you want to evaluate against, and we will propose a way forward.