Who invented the tubular fluorescent lamp (that is, "fluorescent lamp")

1938, Iman of American General Electronics Company invented the energy-saving fluorescent lamp (fluorescent lamp). This fluorescent lamp is a glass tube filled with a certain amount of mercury, and the inner wall of the tube has fluorescent powder. There is a filament at both ends of the tube as an electrode. When electrified, the mercury vapor first discharges, and at the same time, it generates ultraviolet rays, which excite the fluorescent substances on the inner wall of the lamp tube and emit visible light. Because this ingredient is very similar to sunlight, fluorescent lamps are also called fluorescent lamps. Fluorescent lamps are more novel than neon lamps. Neon lamps can only be advertised with their colorful lights. And its brightness is far from enough to provide lighting for people. Fluorescent lamps can be used for lighting. Neon lamp is a high-pressure fluorescent lamp, and fluorescent lamp is a low-pressure fluorescent lamp. Fluorescent lamp has its novelty. After World War II, fluorescent lamps, as a new type of lighting lamps, quickly entered families, schools, factories and hospitals. ...