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Indoor Lighting Sources

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.


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.

Presentations and Meetings

  1. Presentation from September 2016 Stakeholder Meeting
  2. Notes from September 2016 Stakeholder Meeting
  3. Presentation from March 2017 Stakeholder Meeting
  4. Notes from March 2017 Stakeholder Meeting


  1. Needs Assessment Report
  2. CASE Study Results Report
  3. Final CASE Report – Revised December 2017
  4. Final CASE Report
  5. Draft CASE Report

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.

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