| Title |
A Study on the Variations of S/P Ratios and CRIs by Simulating Spectral Combination of CCT-Tunable White and Single LED Spectra |
| Authors |
Jong-Oh Kim ; Hyeong-Seob Jo ; Uh-Chan Ryu |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2019.33.1.013 |
| Keywords |
S/P Ratio ; CRI ; CCT Tunable White LEDs ; Mixing LEDs |
| Abstract |
Human eyes are adopted to the mesophic vision in accordance with luminance levels from artificial lightings which are estimated by the corresponding parameter of S/P ratio. And another parameter to measure a visibility at night is color rendering index (CRI). Nonetheless, there have been rare reports on improving simultaneously S/P raio and CRI for white LED lightings, to the best knowledge of the authors. In this paper, variations of S/P ratio and CRI will be investigated by simulation for a correlated color temepature (CCT) tunable LED lighting, composed of warm white (WW) and cool white (CW) LEDs, along with a single LED spectrum to increase CRI of the lighting. Based on these results, the CRI is over 75 and the S/P ratio is 0.19∼0.56 better than 1.39 for WW-LED and 0.16∼0.36 better than 2.04 for CW-LED. |