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Nonresidential Outdoor Lighting Sources

Measure Description

This CASE Report for outdoor lighting consists of three submeasures: nonresidential lighting zone reclassification, nonresidential lighting power allowances for parking lots, and multifamily outdoor lighting power allowances.

Nonresidential Lighting Zone Reclassification

This submeasure would modify the outdoor lighting zone classifications so they would be based on land use (rural, suburban, and downtown areas) instead of population. This change would result in energy savings throughout the state. At present, 90 percent of California nonresidential outdoor lighting is classified as Illuminating Engineering Society (IES) Lighting Zone 3, which is used to describe city centers. Most of the area that is currently classified as Lighting Zone 3  could be reclassified as either  Lighting Zone 1 (rural area ) or Lighting Zone 2 (suburban area). If a repeatable, unambiguous method of determining outdoor lighting zones can be developed that results in a more accurate classification into the IES Lighting Zone, the state could realize energy savings and benefit from reduced light pollution.

Nonresidential Lighting Power Allowances for Parking Lots

This submeasure would update the lighting power allowances for areas affected by the updated light level recommendations in the latest version of the Illuminating Engineering Society (IES) recommended practice IES RP-20 Lighting for Parking Facilities, which is currently under review and pending publication. Specifically, the Statewide CASE Team expects the recommended light levels to drop, so the prescriptive exterior lighting power allowances would be reduced to reflect the revised recommended practices. The measure also looks to re-assess the need to distinguish between asphalt and concrete surfaces, which currently have different lighting power allowances specifications in Title 24, Part 6.

Multifamily Outdoor Lighting Power Allowances

This submeasure will be developed in coordination with the multifamily team and will investigate the following submeasures.

  • Average Outdoor Lighting Power Allowance
  • Reduce negative impacts of night lighting on human health

Provide Feedback

This measure description will be updated as research is developed to support the 2022 code cycle. For questions or suggestions, email Include the measure name in the subject line.


Give Us Your Feedback

The Statewide CASE Team values input from all stakeholders engaged in the Title 24, Part 6 code change process. We encourage the open exchange of code change comments and concerns.

  • Use the form above to provide feedback on this measure.