What percentage of exterior lighting must have motion controls or photovoltaic cells for Energy and Atmosphere credit Improved Lighting?

For the Energy and Atmosphere credit related to Improved Lighting, the requirement is that 100% of exterior lighting must incorporate motion controls or photovoltaic cells. This standard is in place to encourage significant reductions in energy consumption by ensuring that outdoor lighting is only active when necessary, thus minimizing waste.

Motion controls allow lights to turn off when no movement is detected, while photovoltaic cells permit lighting to draw energy from the sun, enhancing the environmental benefits of the project. By mandating that all exterior lighting fixtures meet this requirement, LEED promotes a comprehensive approach to energy efficiency and sustainable design.

On the other hand, the other percentage options do not meet the rigorous standard set by LEED for this particular credit, as they imply less than full engagement with the technologies that promote reduced energy consumption and exemplify sustainable practices.