As the first major advance in electric lighting, the incandescent light bulb made its appearance in the early 1900s. With the ability to be produced inexpensively for a wide range of voltages, incandescents work via an electric current that passes through a thin filament of tungsten wire, heating it and causing it to release light. This creation brought about changes in commercial buildings in every possible way. However, as technology and demand have progressed throughout the past 100 years, these once-remarkable bulbs are now being replaced by fluorescents, HID lamps, LEDs, etc.