Franklin has employed the science of Visual Ergonomics to enhance your reading experience. FlexVue patent-pending technology gives you color corrected, focused LED light that illuminates the page evenly for an eye soothing experience. Optimized lighting means less eye strain, providing the best reading experience in any lighting condition. Photos and illustrations appear the way they were meant to be viewed. Go green with this energy saving LED device! Firefly light provides hours of reading enjoyment plus uses far less energy than an incandescent lamp.