In theatrical productions, the channel hookup is a printout of a lighting database such as Lightwright that organizes all the lighting information for a stage show by the channel number associated with the lighting equipment and limits the information associated with a particular lighting instrument such that a designer or electrician can access needed information rapidly and efficiently.http://thelightingarchive.org/learn.php Lighting equipment is often organized by

lighting system Lighting or illumination is the deliberate use of light to achieve practical or aesthetic effects. Lighting includes the use of both artificial light sources like lamps and light fixtures, as well as natural illumination by capturing dayligh ...

thereby granting coherence to consecutive channel numbers. Channels 1 through 10 might be

Frontlight {{unreferenced, date=March 2008 A frontlight is a means of illuminating a display device, usually a liquid crystal display (LCD), which would otherwise be viewed in ambient light. This improves its performance in poor lighting conditions. An LCD ...

while 21 through 30 could be

Sidelight A sidelight or sidelite in a building is a window, usually with a vertical emphasis, that flanks a door or a larger window. Sidelights are narrow, usually stationary and found immediately adjacent doorways.Barr, Peter.Illustrated Glossary, 19th ...

from left. In Repertory

Opera Opera is a form of theatre in which music is a fundamental component and dramatic roles are taken by singers. Such a "work" (the literal translation of the Italian word "opera") is typically a collaboration between a composer and a librett ...

and other large venues channel numbers are often granted to lighting equipment by position as the purpose of the light will change from show to show. A Channel Hookup will commonly include Channel, Dimmer, Color, Template and Purpose information. Electronic Theatre Controls has a
Example
online.

References

Stage lighting {{Database-software-stub