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IES TM-30-15 is a new system of several related measures and graphics that can be used together to effectively evaluate and communicate a light source’s color rendering properties. The development of the method involved synthesizing multiple related research efforts and combining ideas into a single, cohesive system of objective information that can be used to aid decision-making processes, such as finding the preferred light source for a given application or evaluating the tradeoffs between efficacy and color rendering.

TM-30 remedies flaws and limitations of the widely used CRI method, while providing complementary and more detailed information. The increased availability of data to characterize color ren­dering can benefit specifiers, manufacturers, and researchers alike, although transitioning from the familiarity and simplicity of CRI will take considerable effort. To facilitate the transition, DOE has compiled a number of helpful resources and frequently asked questions.


TM-30 Development and Logistics

Color Fundamentals 

TM-30 Measures and Meaning

TM-30 Details

TM-30 Data

Application of TM-30


IES Technical Memorandum (TM) 30-15 (Includes Excel Calculators): IES Method for Evaluating Light Source Color Rendition

Optics Express journal article that provides an overview of the IES method: Development of the IES method for evaluating the color rendition of light sources

Webinar: What Have We Learned About TM-30 in the Past Two Years?

Application webinar co-sponsored by DOE and IES: Understanding and Applying TM-30-15: IES Method for Evaluating Light Source Color Rendition

Technical webinar co-sponsored by DOE and IES: A Technical Discussion of TM-30-15: Why and How it Advances Color Rendition Metrics

LEUKOS journal article supporting TM-30’s technical foundations: Why Color Space Uniformity and Sample Set Spectral Uniformity Are Essential for Color Rendering Measures

LEUKOS editorial discussing next steps: IES TM-30-15 Is Approved—Now What? Moving Forward with New Color Rendition Measures

Lighting Research and Technology letter: In Support of the IES Method of Evaluating Light Source Colour Rendition

Lighting Research and Technology article: Human Perceptions of Color Rendition Vary with Average Fidelity, Average Gamut, and Gamut Shape