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Although LEDs are increasingly used in low-energy lighting and displays, consumers sometimes find their light harsh or unpleasant. Findings from a new study point to the need to take age-related perception differences into account when designing white LED lighting that is more pleasing to the eye.
"Our study revealed that the amount of short-wavelength light a source emits together with the viewer's age may lead to very different perceptions of a white light," said the research team leader Aurelien David of Soraa Inc., Fremont, Calif. "LED light sources exacerbate this effect, because their emission often features large peaks of blue or violet radiation."
Researchers - Findings - Optical - Society - OSA
The researchers report the new findings in The Optical Society (OSA) journal Optics Express. They point out that although conventional colorimetry assumes all users have the same visual response, more recently developed models for color perception take age-related effects into account and can be used to predict and help mitigate differences in color perception.
"Today, the color of light is defined by standards based on decades-old science that doesn't accurately predict color perception," said David. "This presents a hurdle to designing better light sources that would minimize inter-user variation and aid in the increased use of LED technology."
Study - Viewers - Sources - Emission - Spectra
For the study, viewers were shown several nearly white LED sources with various emission spectra and asked to rank their perceived tint compared to that of a reference white light. The test sources were part of the researchers' efforts to develop a more sleep-friendly light source. They featured a specialized emission spectrum in which the short-wavelength blue light, which may affect sleep, was replaced with shorter-wavelength violet light that maintains the light's white color.
"According to standard colorimetry methods, all users should have the same...
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