Lux is to broadcast a special webinar on the proposed new method for measuring colour rendering.
The Illuminating Engineering Society of North America developed the TM-30 method last year. Now it’s under consideration by the International Commission on Lighting (CIE), the international authority on lighting. This Lux webinar, on 3 February, will look at the proposed changes.
The current system of evaluating colour has been in use for over half a century, from a time when artificial light was limited to incandescent filaments and mercury discharge lamps. The CIE’s CRI system provides a single number – known as Ra – to describe the colour performance of a light source. With the introduction of the LED, however, the value of this simple reference has been brought into question.
TM-30 attempts to improve on the current situation by introducing a second measurement, that of the colour gamut. Having two connected numbers should provide the specifier with greater information on the performance of light sources. If TM-30 is accepted by the CIE then it’s expected that it will adopted globally.
TM-30 involves establishing 16 measurements based on the chromaticity chart, spaced at regular intervals to create a polygon. Test source results are compared against the reference result and the gamut figure is calculated from the ratio between the two areas.
The Lux webinar will look at TM-30 in detail and what it will mean for the reporting of light specification, for manufacturers and specifiers alike.
The webinar will be presented by Peter Raynham, course director for MSc in Light and Lighting at the Bartlett School for Environment, Energy and Resources at University College London. Raynham chairs the BS committee on Light and Lighting and represents the UK on a number of international standards committees so is in a perfect position to explain how TM-30 will change the way that we judge lighting colour standards. In his presentation he will explain how the changes promised by TM30 will make the specification of colour rendering a far more accurate process.
The webinar takes place on Wednesday 3 February and is free if you register here.
Picture: DM Photography