What is TM-30？

IES TM-30-15 is a document approved by the Illuminating Engineering Society (IES) that describes a method for evaluating light source color rendition. The method encompasses several individual measures and graphics that complement one another and provide a comprehensive characterization of how the light will affect the color appearance of objects. The three highest-level components of the system are the Fidelity Index (Rf), Gamut Index (Rg), and Color Vector Graphic.

Why was TM-30 developed?

The existing color rendering metric widely used in the lighting industry, the International Commission on Illumination’s (CIE’s) General Color Rendering Index Ra (commonly called CRI), was developed more than 50 years ago, and has been unchanged in the last 40. Although it has served a vital purpose, its limitations are widely recognized, including by the CIE. The CIE has been working on a replacement or alternative for more than 25 years, and many researchers have developed and proposed new metrics. The IES Color Metrics Task Group was charged with evaluating the current literature and formalizing a recommended method, with the goal of providing a near-term solution to the limitations of CRI.

Lisun LMS-6000S Portable CCD Spectroradiometer , LPCE-2 High Precision Spectroradiometer Integrating Sphere System and LPCE-3 CCD Spectroradiometer Integrating Sphere Compact System can measure TM-30 of light source, which includes Fidelity Index (Rf) and Gamut Index (Rg).