TM-30-15 Explained by MEGAMAN®

(Hong Kong – 28 June 2017) A key advancement in lighting design has been the recent introduction of TM-30-15 as a colour measurement system. This seeks to displace Colour Rendering Index as the current industry standard.

When using the traditional CRI system, the only way a designer can be sure they get the colour quality they want, is by obtaining multiple manufactures’ lamps and testing them in situ. This is because product data sheets cannot guarantee a high colour rendering accuracy because the current CRI system allows for too many inaccuracies.

The CRI system was developed many years ago and uses out-dated formulae and tools by today’s standards. Even before the solid-state lighting revolution, the industry faced issues when trying to compare the colour of different light sources - and the introduction of LEDs has only exacerbated this.

CRI, known as Ra, tends to be inaccurate because it only uses fidelity (fidelity index – closeness to a reference) to measure light, which is then taken from a maximum of 14 Colour Evaluation Samples (CES). However this index averages only 8 of the 14 colours, which is why many Ra values can be the same for different lighting products.

TM-30-15 on the other hand goes far beyond traditional CRI. This benchmarking system comprises three main components

Rf – a fidelity index that is similar to the commonly used CRI

Rg – a gamut index that provides information about saturation

Colour vector graphic – a graphical representation of hue and saturation relative to a reference source

TM-30-15 uses 99 Colour Evaluation Samples (compared to CRI’s 14) to measure colour fidelity, which uses better colour space, spectral uniformity and covers a broader range of colours. Furthermore, it is a significant improvement that TM-30-15 includes a saturation index (Rg) and new research shows that saturation has a significant affect on our perception of colour rendition and light levels.

TM-30-15 provides a broader and more detailed understanding of colour rendering between different light sources. This represents a more comprehensive way to compare light sources like for like, but also allows manufactures the ideal opportunity to embrace a form of ‘best practice’ when it comes to light measurement.

Ultimately, the introduction of TM-30-15 is helping to create a stronger, credible dialogue between manufactures and designers to ensure lighting specifications are fit for purpose and perform as expected.



MEGAMAN® is a global brand in high-performance, energy-efficient lighting and an innovative leader in LED and CFL lamp design, with technology targeting the best eco-lighting solutions. MEGAMAN® products are widely distributed throughout the world, including Europe, Asia Pacific, Middle East, Africa and South America, covering more than 90 countries and territories. By setting environmental management as one of the company's highest priorities, MEGAMAN® is focusing on eco-friendly environmental processes from initial design, to manufacturing, research and development, and the disposal and recycling of its products.

For more information about MEGAMAN®, please visit the website at

For further information, please contact:
Wendy Lam
Neonlite Electronic & Lighting (HK) Ltd. – MEGAMAN®
Tel: + 852 2378 0074         Fax: +852 2758 5957