Industry Articles

Lighting technology has evolved dramatically over the past century, improving efficiency, reducing maintenance costs, and helping businesses lower their energy consumption. While halogen, metal halide, and high-pressure sodium (HPS) lighting once dominated commercial and industrial applications, modern LED lighting has become the preferred solution for facilities seeking maximum efficiency and longevity. Understanding how these technologies originated, how they work, and how they compare can he …

(reprinted with permission)   Summary The human eye contains 2 major light sensitive photoreceptors, namely cones and rods each with its own spectral sensitivity, photopic sensitivity for cones and scotopic sensitivity for rods. At light levels typical of night time roadway lighting, both cones and rods can be active and both spectral sensitivities could apply. However for straight ahead viewing where the line of sight is directed to distant object detection and recognition, such as a pedes …