Light pollution reduction (LPR) filters work because many outdoor lighting sources do not shine evenly across the visible spectrum. Instead, they emit radiation at only a few distinct wavelengths. For ...

Can Hoya's budget-friendly Starscape filter reduce light pollution and take your night city shots and astro pictures to the next level?

A number of past studies have found that exposure to blue light later in the day may disrupt one's sleep pattern, making it difficult to fall and stay asleep. New research out of the University of ...

Several light sources produce light across various wavelengths. While this wavelength spectrum can be useful in lighting applications, other applications require light with a restricted visible ...