This Full Spectrum tube/light bulb is not supplied with the Dazor® 2-tube or 3-tube lamps but is a terrific option for jewelers, artists, dentists, crafters or anyone else who needs true-color daylight lighting. One of the benefits of full-spectrum lighting includes correct color perception. This is imperative where correct color is needed for seeing or properly matching an item. These lamps also have less glare. The reduction of glare, which in turn reduces eyestrain, headaches, and fatigue, can greatly increase productivity. Produces 5900 Kelvin (Kelvin is a measure of color and does not indicate heat. These bulbs generate the same amount of heat as a standard fluorescent tube). Advocates of full-spectrum lighting claim increased health benefits and feelings of well-being due to its simulation of natural outdoor light. Some health professionals use it to treat a condition known as Seasonal Affective Disorder (SAD). To be used with 115V lamps only.