His light-kinetic sculpture for the Edison transformer station at Jeruzalémská street in Prague remains, along with László Moholy-Nagy's Light-Space Modulator (1922–30), a fundamental work of light-kinetic sculpture of the century. The sculpture can be considered an automatised version of (soundless version of) Spectrophone; it counted 420 colour bulbs (seven rows of white, yellow, green, blue, violet, red, and orange, 15 bulbs each, in each of four parts) and produced pre-programmed light-kinetic "shows" regularly from 7 to 8 PM. "Edisonka" was portrayed by Otakar Vávra and František Pilát in the short film Světlo proniká tmou [The Light Penetrates the Dark] (1931). It is hailed as the world's first public kinetic sculpture. It operated from October 1930 until 1937, and was Pešánek's first realisation in his over a decade-long collaboration with the Electric Company of the City of Prague [Elektrické podniky hlavního města Prahy]. Next to a number of light advertising works, Pešánek organised a lecture and workshop cycle O světle [About Light] (November 1931–1932) to discuss and introduce artistic considerations into context of street lighting and light advertising.