Spectral and colorimetric characterisation of LUTI: a lutein-pigmented functional paper for reduced blue-light reflectance

LED lighting exhibits a pronounced short-wavelength peak that can contribute to visual discomfort during near-work tasks. This study evaluates LUTI, a lutein-pigmented paper, designed to selectively attenuate blue-light reflectance while maintaining colour neutrality and material stability. Spectral, colorimetric and ageing measurements demonstrate that LUTI reduces reflectance in the 400–480 nm region with minimal chromatic shift and acceptable stability. The findings support the concept of natural-pigment functionalization of paper for improving visual ergonomics in LED-illuminated environments.