XS SIGHT SYSTEMS FOR STANDARD DOT TRITIUM SIGHT FOR COLT COBRA/KING COBRA Standard Dot Night Sights are defensive tritium sights designed to enhance your defense gun. The sights use a proprietary photoluminescent Glow Dot that absorbs ambient light and glows in low light. The convex dot's additional surface area increases light absorption, intensifying the charge of the Glow Dot. Designed to be large and highly visible, these sights help solve many issues, from aging eyes to deteriorating vision. We've found that green is an excellent option for low light and has a very bright glow intensity. Orange is excellent for bright lighting conditions, has a very good glow, Mfg: Xs Sight Systems