Intensity Color
The Intensity Color page computes a CIE chromaticity coordinate for each emission angle from the Intensity detector's far-field spectrum, translating emission intensity data into visible-color information. Results are displayed as a CIE 1931 chromaticity diagram and a per-angle color table.
Requirements
- The Intensity detector is enabled in the Emission lane of the Optics page.
- The Intensity Wavelength Mode is set to Sweep.
- The wavelength sweep covers 360–780 nm at a step of ≤ 5 nm.
Reading the chromaticity
The chromaticity diagram uses the CIE 1931 standard, mapping each angle's integrated emission spectrum to an (x, y) coordinate. Each angle with visible emission appears as one point on the diagram.
Observer standard: Chromaticity calculation supports both the 2° standard observer and the 10° standard observer, selectable in the Intensity configuration panel on the Optics page. The observer is frozen at the time of calculation — changing it after a run does not update the result; a new run is required.
Angle distribution: When Intensity uses angle sweep (Angle Mode = Sweep), the diagram shows one point per emission angle, representing the color at each direction. If the emission color is uniform across angles, all points cluster at the same location.
When multiple chromaticity points are present, the "Connect Data Points" toggle in the right-side controls draws a line through the points, making it easy to track how color shifts across emission angles.
If any angle has no effective emission in the visible range (360–780 nm), that angle is omitted from the diagram and a skipped-angle count is shown on the page.
When color is unavailable
When any of the following conditions occur, the Intensity Color page cannot display chromaticity results and shows a corresponding message:
| State | Description |
|---|---|
| No result | The Intensity detector has not been run. Run the calculation first. Message: "Run the Intensity detector to compute emission color." |
| Weighted Average mode | Intensity is in Weighted Average wavelength mode — the wavelength dimension is collapsed and cannot be integrated for chromaticity. Switch to Sweep mode and rerun. Message: "Wavelength is in Weighted Average mode — switch Intensity wavelength to Sweep to compute color." |
| Single wavelength | Only one wavelength point was sampled. Computing chromaticity requires a multi-point spectrum covering the visible range. Set wavelength to a Sweep covering 360–780 nm and rerun. Message: "Only one wavelength sampled — set Intensity wavelength to a Sweep covering 360–780 nm to compute color." |
| No visible emission | No visible emission was detected in the sampled range (integrated intensity in 360–780 nm is zero). Check the emitter spectrum file or EML configuration. Message: "No visible emission in the sampled range." |
Controls
| Control | Function |
|---|---|
| Observer (2° / 10°) | Select the CIE standard observer in the Intensity configuration on the Optics page; affects the calculation, not just the display — a new run is needed for changes to take effect |
| Chart / Table toggle | Switch between the CIE chromaticity diagram and the per-angle color data table |
| Connect Data Points | Draw a line through chromaticity points in angle-sweep mode |
| Export CSV | Export per-angle chromaticity coordinates and color values |
Next
To see how emitted power is distributed across optical modes (Top Outcoupling, Bottom Outcoupling, Waveguide, etc.), go to Mode.