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Schierz, C. IS LIGHT WITH LACK OF RED SPECTRAL COMPONENTS A RISK FACTOR FOR AGE-RELATED... 0,7 0,6 0,5 0,4 0,3 0,2 0,1 0,0 -0,1 -0,2 -0,3 -0,4 -0,5 -0,6 -0,7 2000 Planck 27 Planck 30 Planck 35 LED white (CRI77) FL CIE F12 Planck 40 Planck 45 D45 D50 LED white (CRI92) Planck 47 LED white (CRI82) Planck 50 FL CIE F9 LED Sunlike (Seoul, CRI97) L E D wF L h Ci t I e E ( F C 8 R I 8 0 ) D55 Planck 55 D65 FL CIE F7 LED white (CRI75) 6000 7000 D75 0,00 -0,05 -0,10 -0,15 -0,20 -0,25 -0,30 -0,35 -0,40 -0,45 70 465 nm 455 nm 455 nm 0,00 -0,05 -0,10 -0,15 -0,20 -0,25 -0,30 -0,35 -0,40 -0,45 455 nm 465 nm 465 nm 445 nm 445 nm 75 CCT = 4000 K Parameter: LED peak-wavelength CCT = 4000 K Parameter: LED peak-wavelength 465 nm 465 nm 445 nm 455 nm 465 nm 445 nm 455 nm 80 445 nm 455 nm 445 nm AMD protection index CAMD AMD protection index CAMD AMD protection index CAMD 85 90 95 100 -20 -10 0 10 20 30 40 50 60 70 80 90 100 Special colour rendering index R9 Colour rendering index Ra Correlated colour temperature Tcp / K Figure 4 – Association of the correlated colour temperature Tcp with the AMD protection index for several light sources like daylight illuminants (blue), Planckian radiators (red), fluorescent lamps (black), and LEDs (green). The underlined value and the underlined values in Figure 5 correspond to the same LED spectrum. Figure 5 – Association of the CIE 1974 general colour rendering index Ra (left) and the special colour rendering index R9 (right) with the AMD protection index for several phosphor converted white LEDs with a fixed CCT of 4000 K but with different blue peak wavelengths. The underlined values and the underlined value in Figure 4 correspond to the same LED spectrum. 6 Conclusions This paper serves the purpose to give a short overview of the state of knowledge about the mechanisms connecting light to AMD . The idea that light with lack of red spectral components could be a risk factor for AMD comes from the first reports about a successful therapy called “photobiomodulation”. This therapy shows good results by using red and NIR radiation which acts as antagonist to the detrimental effects of blue spectral components. Taking into account molecular processes, a preliminary proposal for possible spectral weighting functions for risk and protective light effects could be found and an “AMD protection index” could be derived. However, it should be noted that the available scientific basis does not allow drawing a final conclusion. Although scientific indications suggest a reasonable suspicion of beneficial red light and NIR effects, there is a need for further research. A scientific confirmation can only be reached when scientific studies of independent research groups come to the same reproducible results, and when the overall scientific picture supports the existence of a causal connection which is also valid in everyday situations. Some open problems are the following: Proceedings of 29th CIE Session 2019 119 D 8 5 3000 4000 5000 8000 9000PDF Image | LIGHT WITH LACK OF RED SPECTRAL COMPONENTS v amd
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