Does correlated color temperature affect the ability of humans to identify veins?

Enhanced luminescence of manganese in singly doped white light zinc phosphate glass

“…Phosphor‐converted white‐light‐emitting diodes (pc‐WLEDs) are emerging as an indispensable solid‐state light source due to their unique properties including but not limited to energy savings, environment‐friendliness, small volume, and long persistence . Until now, major challenges in pc‐WLEDs have been to achieve a high luminous efficacy, high chromatic stability, brilliant color‐rending index (CRI), and price competitiveness against fluorescent lamps, which rely critically on the phosphor properties . While the field of luminescent materials for solid‐state lighting has seen a tremendous increase in the past two decades, the most common way to generate white light is the combination of blue LED chips with yellow‐emitting phosphor materials .…”

“…2,5,6 Until now, major challenges in pc-WLEDs have been to achieve a high luminous efficacy, high chromatic stability, brilliant color-rending index (CRI), and price competitiveness against fluorescent lamps, which rely critically on the phosphor properties. [7][8][9][10] While the field of luminescent materials for solid-state lighting has seen a tremendous increase in the past two decades, the most common way to generate white light is the combination of blue LED chips with yellow-emitting phosphor materials. 11 However, the difference between individual degradation rates of chips and phosphors coated on chips would cause a chromatic aberration and a poor white light performance.…”

The Influence of Illumination Color on the Subjective Visual Recognition of Biological Specimens

“…These results are consistent with the previous findings that the illumination in which the red component has been suppressed is more suitable in the recognition of blood vessels on the rat cecum 5 but less suitable in the recognition of the human vein beneath the skin compared to white illumination. 4 Because those previous studies compared a single illumination color with white using single-tissue samples, it was not clear why the bluish illumination exerted the opposite effects on the visual recognition of biological specimens. Using multiple illumination colors and tissues, the current study found that biological specimens have a characteristic illumination color that is adequate for the visual recognition of individual tissues.…”

“…However, only a limited number of subjective experiments have been previously reported. 4,5 Although Argyraki et al 4 reported that white illumination is more suitable in the recognition of the human vein beneath the skin compared to the illumination in which the red component has been suppressed, Kurabuchi et al 5 demonstrated that the recognition of blood vessels on the rat cecum was improved by an illumination containing less red component compared to white illumination. Because these studies claim the superiority of distinct illuminating colors using different tissues, it is still unknown whether each tissue has a specific color that can enhance its visual recognition or whether one color can improve the recognition of every tissue component.…”

“…Therefore, we carried out visual recognition experiments to observe the subjective preference for the illumination color based on questionnaires using several rat tissues under the illumination of multiple colors. Because the previous subjective studies reported the effect of bluish illumination containing less red component, 4,5 we focused on the effect of illumination colors along red-blue axis in this study for comparison.…”