The Model Lighting Ordinance (MLO), created by a joint task force of the International Dark-Sky Association (IDA) and Illuminating Engineering Society of North America (IESNA), was approved for public release on June 14, 2011. The MLO is now available for usage by cities and municipalities who are seeking to develop an outdoor lighting regulatory standard that will reduce light pollution, including: glare, light trespass and skyglow. This is achieved through adoption of the MLO because it calls for automatic lighting switches when sufficient sunlight is available and automatic lighting reduction, when light is needed but sunlight is not available. The MLO adopts different regulations for five lighting zones; no ambient lighting, low ambient lighting, moderate ambient lighting, moderately high ambient lighting, and high ambient lighting, making its regulations applicable to various municipalities. The MLO also prescribes how to regulate residential and non-residential lighting. For example, the MLO imposes a total site lumen limit, which changes with respect to residential and non-residential sites. The MLO also suggests light shielding that is specific to the area of usage, such as parking lots, building entrances, and residential landscape lighting.