The Luxo WAVE with stadium shaped lens offers the largest distortion-free viewing area in the industry. This magnifier features a 13" focal length and a 6-3/4" x 4-1/2" viewing area in a 3.5 diopter (1.85X) model. Two 13-watt compact fluorescent lamps with individual lamp switching. Blue indicator lights are located on either side of the magnifier head. UL/CUL listed.