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The next evolution of the luminaire took place in two directions: the carbon filament was replaced in 1907 by tungsten and from 1913 onwards the lamp was filled with inert gas (at first nitrogen gas, then converted to argon and krypton gas). Both innovations have been made in General Electric laboratories, founded by Thomas Edison himself. Honor the fallen never forget face mask. The modern incandescent lamp that we know is widely used in everyday life, however cannot be said that its light is ideal: it is shifted to the red and infrared bands of the optical. spectrum. The effect is also modest: its lighting efficiency is only 1% to 4%. In this sense, an incandescent lamp is a heating device rather than a lighting device.