An art term, it refers to the quality of having luminism or emitting light. Source: Ralph Mayer, "A Dictionary of Art Terms and Techniques"<br><br>The emission of electromagnetic radiation, especially of visible light, stimulated in a substance by the absorption of incident radiation and persisting only as long as the stimulating radiation is continued. Also, the property of emitting such radiation, or that radiation itself. Various things can be fluorescent, most commonly lamps in the form of tubes whose inner wall is coated with a material that fluoresces when an electric current causes a vapor within the tube to discharge electrons. Also see incandescence, infrared reflectography (IR) and reflectogram, kelvin, neon, radiograph, stroboscopic, ultraviolet, and x-ray.