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Indoor Light Sources

Nonresidential Lighting

Codes and Standards Enhancement (CASE) Report

The Statewide CASE Team 2019 Title 24, Part 6 Final CASE Report is available below. The Final CASE Report incorporates feedback received during utility-sponsored stakeholder meetings, Energy Commission Pre-Rulemaking workshops, and personal communication with stakeholders. We encourage stakeholders to email feedback on the Final CASE Report to You can also participate in the 2019 Title 24, Part 6 Standards updated by attending the Energy Commission workshops and submitting written comments to the rulemaking docket. Refer to the Pre-Rulemaking and Rulemaking Workshop Notices for instructions on how to submit comments to the Energy Commission’s docket (available here).

Measure Description

This proposal updates the allowed lighting power density (LPD) values (watts of lighting per square foot of room floor area) for indoor lighting to reflect the increased efficacy and increased optical control associated with light emitting diode (LED) technology. The recommended revisions will modify the allowed lighting power for three calculation methods:

  • Complete Building Method
  • Area Category Method
  • Tailored Method

The revised LPD values were developed accounting for increases in LED efficacy that have been occurring over the last several years in all varieties of nonresidential LED luminaires. In addition, increased efficacy has been mandated for certain lamp products by the California Appliance Efficiency Regulations (Title 20) that were adopted in 2016 and the United States (U.S.) Department of Energy (DOE) LED efficacy regulations that are being developed concurrently. This proposal builds upon efforts to update the LPD requirements in ASHRAE 189.1-2017: Standard for the Design of High Performance Green Buildings. However, this proposal does not mandate a particular technology; as long it requires no more adjusted lighting power than the allowed wattage.

Request for Feedback

The Statewide Utility Team encourages participation in the CASE Report development process through the submission of data—both primary sources and references to existing data. We are requesting data on areas such as energy savings, costs, market impacts, industry practices, barriers to code compliance, etc. from stakeholders. The data will inform the energy savings estimates, cost-effectiveness analysis, compliance and enforcement, and market impacts that will be presented in CASE Reports.

Do you have feedback or data to share? Send us an email at