Measuring, regulating, signaling, checking and supervision apparatus and instruments, namely, lasers for measuring purposes, voltage regulators, rotating signaling lights; devices, namely, apparatus for recording, processing, transmitting and reproducing sound, images and data; electrical and electronic apparatus and systems for controlling light signals, light effects and light shows, namely, electrical controllers, electrical controlling devices, electric control panels; electrical and electronic control units and control devices for lighting systems, spotlights, lights and dimmers; electric light control desks, namely, control desks specially adapted for electrical control equipment for controlling light signals, light effects and light shows and control desks specially adapted for electricity control equipment for lighting control purposes; lighting control consoles, namely, electricity distribution consoles for use with stage lighting, studio lighting and light shows; light regulators, namely, digital dimmers being electric light dimmers; electrical and electronic apparatus and systems for processing, amplifying, duplicating, mixing, converting and transmitting control data and control signals, namely, data processors, sound mixers, wireless transmitters and receivers; voltage regulators for stage lighting; power supply units consisting primarily of power supplies, inverters for power supply, electrical power connectors; power distributors, namely, electrical power distribution blocks, electricity distribution consoles, distribution transformers; electricity current limiters for lighting apparatus, namely, electric current switches; electrified rails for mounting spotlights, namely, electric conductor rails; data processing apparatus and computers; computer software for controlling light signals, light effects and light shows; computer software for visualizing stage shows and for creating three-dimensional stage layouts