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Learn & Plan Topics

  • Indoor Environmental Quality (IEQ)

    Indoor Environmental Quality (IEQ) is most simply described as the conditions inside the building. It includes air quality, but also access to da...

  • Energy & Atmosphere

    Buildings and facilities rely on the operation of mechanical systems and electrical systems to maintain a high level of indoor environmental qual...

  • Sustainable Sites

    Choosing a building's site and managing that site during construction are important to ensure a project's sustainability. Environmentally responsibl...

Lighting Power Density (LPD)

Lighting Power Density (LPD) is the electrical load of lighting per area lit, measured in watts per square foot. 


Many spaces are overlit (i.e., LPD too high), leading to wasted energy and potential occupant discomfort. Getting LDP right is therefore critical to resolving multiple lighting challenges. Learn more through GSA's Saving Energy through Lighting and Daylighting Strategiesopens in new window resource. 

Whole Building Systems

  • Lighting - LEED ID+C: Commercial Interiors (v4)

    LEED ID+C: Commercial Interiors emphasizes daylight as a beneficial lighting strategy for the whole building. The rating system puts a preference on...

  • Lighting - Energy Use

    By consuming 17% of the building’s total electricity consumption and further influencing overall energy demand by the waste heat it emits, lig...

  • Lighting - Example Survey Questions

    What percentage of all lighting in the facility is "high efficiency lighting"?

  • Lighting - System Overview

    Lighting accounts for nearly 20% of the total electricity costs of commercial buildings in the United States.1 Effective lighting systems invol...

  • Lighting - Lighting Impact on Occupants

    Lighting Ecosystem Lighting in the workplace can be better understood as an ecosystem that includes lighting design as just one component of a netw...

Materials

  • LED

    Light Emitting Diode (LED) lights have become the most energy efficient and most life...
  • Automatic Low-Power State

    The first, and in some cases most effective, control method is a built-in, automatic low-power state functionality such as standby or sleep. Some ma...
  • Direct Down Lighting

    Direct down lighting with 2-by-4 or 2-by-2 fluorescent fixtures are common in office buildings and are usually recessed into a dropped ceiling. The...
  • Task Lighting

    Task lights are designed to provide the occupant control of the light levels in their workspace. They illuminate specific work areas and allow fo...