Daylight Ultra Slim Magnifying Lamp XR Powerful 28w daylight tube with white crystal clear 7" xr lens (1.75x, 3 diopter) The xr technology makes the lens 50% lighter and extra resistant Self-tightening head joint for easiest positioning 2 Additional lenses available separately: Daylight U62001 XR Lens & U62002 Swing Arm XR Lens Replacement bulb: 28w daylight u12000 energy saving circular tube