To greenlight a project, in the context of the movie business, is to formally approve production finance, thereby allowing the project to move forward from the development phase to pre-production and, barring disasters, principal photography. A project which is financed is said to be greenlit and a studio executive who has authority to grant greenlight status to a project is said to have greenlight power.

Executives who have true greenlight power are few and far between. It is usually the case that only one person in any given financing entity has true greenlight power and that those who have nominal greenlight power in the management structure beneath them must seek their approval for projects which they wish to greenlight.

The trials and tribulations of taking a project from pitch to greenlight formed the basis of a successful reality TV show titled Project Greenlight

The term "greenlight" has managed to find its way into business and military culture as a result of its use in the film industry.

Greenlight is also an European Union program, to reduce lighting energy use, thus reducing polluting emissions. External link: Greenlight (http://www.eu-greenlight.org/)