The classic "Ilyich's light bulb" is a household incandescent lamp, the cartridge of which is suspended from the ceiling by a wire and hangs freely. Plafond is missing. In those years, the electrical switch was located in the cartridge case, the electrical wiring was carried out with a two-wire twisted wire, the electrical insulation of each wire was rubber, with a thread braid. Electrical wiring was attached to wooden walls on porcelain roller insulators.
In the collections of "proverbs of the Soviet people" published in Soviet times, the following phrase was cited as a contrast between the pre-revolutionary and Soviet periods: "There was an oil lamp, but and candle - now Ilyich's lamp."