Dazor's circline magnifying lamps provide even, shadow-free light. The circular light source uniformly illuminates the viewing surface so that color contrasts are enhanced without competing shadows. The 5" diameter lens is precision ground, crown optical glass for near-zero light refraction and has a 5 Diopter (2.25X) lens. Arm has a 28" reach and sits on a weighted base. Uses a 6500K daylight LED lightsource to provide optimal viewing, with a 1,440 lumen output. Five year warranty.