The Ring Handheld Magnifier offers a large round 4-diopter magnifier lens and 22-watt fluorescent bulb for bright, even illumination. For greater magnification, a 12-diopter insert bubble located on the lens is offered. This light was developed specifically for dermatology applications. Features A 22-watt fluorescent bulb provides 6500K color temperature for accurate diagnosis 4-diopter magnifier provides a large 4.5" viewing area 12-diopter insert bubble also included for more detailed inspection Electronic ballast for flicker-free illumination and energy efficiency Long, 7'6" cord