Color Science - TM-30-24 Online Calculator

Overview

As the industry moves away from the limitations of the traditional Color Rendering Index (CRI), the Illuminating Engineering Society (IES) has introduced TM-30-24. This latest update streamlines the method for evaluating light source color rendition by providing a robust online tool for calculating Fidelity (R_f) and Gamut (R_g). The PNNL Applied Lighting Spectral Calculator (https://spectralcalculator.pnnl.gov/) is the official tool for computing these metrics.

Differences Between TM-30-24 and Earlier Versions

• Platform Independence: The IES has transitioned from standalone, macro-enabled Excel files to a centralized Reference Implementation via the PNNL Spectral Calculator. This ensures all users access the most up-to-date logic without version-control issues.

• Color vector graphic: Reorganized the graphic metrics location and emphasize Red Fidelity R_f,h1 (lower left) and Red Chroma Shift R_cs,h1 (lower right) metrics, which are critical for high-end architectural and retail lighting.

             

                                               TM-30-24                                                                   TM-30-18/20

• Alpha-opic Integration: The tool now calculates alpha-opic quantities (e.g., melanopic lux) based on CIE S 026/E:2018, supporting the growing demand for circadian and integrative lighting design.

 

How to Use the Calculator:

1. Access the Tool: Navigate to the PNNL Spectral Calculator.
    
2. Input Data: 
   • You can upload SPDX files (Standardizing Photometric and Colorimetric Data Exchange, ANSI/IES TM-27-20 format).
   • Alternatively, use the Excel template provided on the site or simply paste spectral power distribution (SPD) data directly into the interface.
      
3. Batch Processing: For large-scale projects, use the User Library to process thousands of SPDs simultaneously.
    
4. Select Metrics: Ensure TM-30-24 and, if needed, CIE S 026/E:2018 are selected.
    
5. Generate Reports: 
   • Download results in .json or .xlsx formats for data analysis.
   • Export high-resolution Color Vector Graphics as .png or full specification reports as .pdf.

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