Dazor J Series 3-inch magnifiers feature a 3.5" 5-diopter optical grade lens. Comes standard with a full-spectrum bulb for correct color perception. The energy-efficient 18- watt compact fluorescent is as bright as a 75W incandescent bulb. In addition, J series magnifiers can also be outfitted with a black-light tube for optional Woods Light (ordered seperately). Features a flexible gooseneck design and instant-on flicker free light powered by electronic ballast and a 3.5" 5-diopter optical grade lens.