It is glowing in a General Electric building in Schenectady, New York. Fluorescent lights have been around for a while. These lights are very different from incandescent light bulbs. Fluorescent tubes have no filament to glow. The gas in the fluorescent tube conducts electricity.
Electricity makes the gas release invisible u ltraviolet energy.
The ultraviolet energy strikes a luminescent coating on the inside of the tube. The coating is called phosphor. The phosphor coating is what glows in the tube giving off light. Now, some companies like General Electric Canada are making fluorescent bulbs for use at home. These new fluorescent bulbs have been built to replace ordinary light bulbs.