We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Rory Evans Rory Evans is a writer focused on skin-care and beauty products.

Abstract: In this study, we conducted a combined examination of the photometric and colorimetric performances of trichromatic light sources, which are synthesized by three kinds of light-source units, ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Nancy Redd Shifts in the number of daylight hours — due to changing seasons or ...