32 LIGHTING LED FUTURE
high CRI fixtures. CRI is not relevant for multicoloured fixtures. What is important is how precisely we can create white light throughout the kelvin range (staying on the Planckian locus curve) and how large is the colour space of the fixtures. CQS is a good existing way of measuring the colour space size of multicoloured LEDs. Mike Wagner, lighting product manager, ARRI: Yes, I believe that lighting companies should adhere to colour standards for LED lighting. While there is no perfect metric for this, colour rendering scales can serve as a starting point for colour quality indication. There are other metrics such as TM-30 which seem to give more accurate results. However, for image capture the best metrics will always be the camera the user is shooting with. Def: How much heavier will the dependence on data in today’s fixtures be before recognisable data infrastructures will be implemented? FH, Kino Flo: Colour changing light fixtures are all about data. We already have an infrastructure for data in DMX. Fixture profiles are shared with board manufacturers so they can
a standard in a rapidly evolving technology field is counterproductive. You run the danger of impeding technology. NTSC vs PAL is an example. Chuck Edwards, CTO, Cineo Lighting: Yes, but the problem today is more with regards to colour matching of hue and saturation changes. In white light we have well-known standards for colour temperature (CCT) and quality (CRI, TLCI) and the better quality lighting companies provide reliable and high-quality white light. But matching digital colour adjustments that we call ‘digital gelling’ and saturated colours is still something that has a single accepted standard. Cineo in conjunction with NBC Universal is developing a correlated hue saturation intensity and CCT(K) colour standard called NU_HS1.2. It directly correlates Cineo and LightBlade LED lights to the Rec. 2020 standard used for cameras, monitors and HD content. Kaur Kallas, CEO, Digital Sputnik: The CRI of a DS line of fixture hovers around 75 at daylight due to having peaks and valleys in the spectrum. Due to these peaks matching up with CMOS sensor sensitivities we are able to deliver more pleasing skin tones then
DEFINITION AUGUST 2018
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