The very elaborate measurement methods and equipment available today show high precision values. The TLCI (Television Lighting Consistency Index) system represents a very valid step forward in the evaluation of color quality of LED lights. This system is based on the evaluation related to studio cameras, working with 3 CCD sensors and a prism. The overwhelming majority of mobile cameras, even the best ones, work with CMOS sensors. Such cameras and such sensors have the ugly habit that they react to LED light very differently. Thus, cameras of the same manufacturer can show noticeable differences when used with LED light. Difficult to correct.

The examples shown here are representative for the practical tests, which we have been conducting for many years. Since, for example a Canon 5D MarkII camera was showing completely different color values, as opposed to the Canon
5D MarkIII, for a long time this appeared to be an unsurmountable difficulty.

In order to make tests more related to daily work, we have made tests with different skin tone values, lighting one side of the face with LED light, and the other side with a reference light, trying to establish or evaluate matching skin tone rendition.

For this we use different skin tones, from Scandinavian to Mexican, to Ethiopian, and Angolan skin tone (being the darkest skin tone).

Only after many years of such tests and endless attempts to find improvement, we can now say that we have achieved a nearly perfect match between skin tone rendition of LED light and reference light.

As reference light we have used halogen lights with 3000K, 3200K, as well as 3400K, because such halogen lamps (special test lamps) show a totally homogenous and reliable color spectrum.

To find a daylight reference light is much more difficult.

We did not want to use HMI light sources, also other light sources, even the scientific ones don’t show a homogenous spectrum. Thus, we decided to use traditional Kino Flo daylight tubes, which do not have a perfect spectrum, but are widely used worldwide.

The final results made us very proud and eliminated a lot of nightmares which we had for many years, when originally the perception of different cameras showed very different results.

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