Radiance
Lawrence Berkeley National Laboratory
Download from the vendor
www.radiance-online.org
A physically based ray-tracing lighting simulation engine that computes natural and artificial light in a building in real lux and luminance values, not just a pretty picture. It is the engine behind most daylight calculations in green building standards worldwide, and it is accurate enough to serve as evidence in design.
Ratings & Reviews
| Licence type | Completely Free, Open Source |
|---|---|
| Licence terms | Open-source licence. Free for any purpose including commercial work, with no time limit, no registration and no licence key. |
| Platforms | Linux, macOS, Windows |
| Engineering field | Architecture, Mechanical Engineering |
| Tool type | Simulation & FEA |
| Vendor site | www.radiance-online.org |
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Last verified: 2026-09-02
