Dimming technology has evolved considerably over the last decade, especially in the arc discharge lamp category. What began as a device for simply matching lighting levels to various tasks and moods has emerged as a tool for reducing energy usage. The reduction in light output can be accomplished either as a step function or as a continuous function. The adjustment of light levels over a linear or continuous range is appropriate for areas like lecture halls, meeting rooms, classrooms and even open-office areas, in addition to restaurants and entertainment locations.