Offex Office Table LED Magnifying Lamp - Black 3 Diopter Glass Magnification Lens. Flexible Arm Extends up to 36 inches. Steel Spring and Tension Control Knobs. Color: Black. LED with 8,000 Average Hours of Life. Lumens: 480. Clamp Mounts Easily to All Offex Tables. Overall Dimensions: 7.5"W x 10"D x 36"H