Streamlight Jr. LED is a compact light that uses a brilliant C4 LED that lasts 50,000 hrs! C4 LED Technology Focuses Light on Objects Hundreds of Feet Away! Photonic Crystal and Thin Film Flip Chip, among other technologies combine to make LEDs even better! Such enhanced efficiency as well as innovative use of reflectors to magnify, direct and intensify light beams, makes Streamlight C4 LED flashlights two to three times brighter than traditional LED flashlights.