Ultra-Efficient Clamp-Mount SMD LED Magnifying Lamp 1100 Lumen on Just 15-Watts Large 7" x 5-1/4" Three-Diopter Lens Premium 2-in-1 lighting & magnification tool for professional, home or hobby use - great reading aid Precision polished 7" x 5-1/4" 5-diopter glass lens increases viewed text or objects to 225% normal size with excellent clarity 84 ultra-efficient SMD-LED produce amazing 1100 Lumen brightness on just 15-watts energy consumption, Three brightness settings let you select perfect light level. Average life 100,000 hours Fully-enclosed spring arm prevents accidental finger pinches, position memory for easy angle and height adjustment Sturdy clamp attaches quickly to desk or table up to 2-1/2" thickness, preserves more of your work area than base-style lamps