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Nonresidential Indoor Lighting

Measure Description

This CASE Report for nonresidential indoor lighting consists of two submeasures: update lighting power densities and multi-zone occupancy sensing in open plan offices.

networked lighting controls and

Update Lighting Power Densities

This measure updates indoor LPDs and wattage calculations. The updates to interior LPDs are driven by the following factors: 

  • Ongoing LED technology advancement and improved integration into luminaires, including efficacy degradation for high CRI sources, lower lamp lumen depreciation factors over the expected effective luminaire life and improved optical control and optical efficiency.  
  • Better integration of task/ambient lighting design approach. Confirm general lighting allowances are not also covered under use-it-or-lose-it adders. 
  • Careful review of the use-it-or-lose-it adders and how these are enforced in the forms and performance approach such as the Small Aperture Tunable-White and Dim-to-Warm Luminaires Lighting Power Adjustment. 
  • Update the LPD of spaces which are currently conservative.  Examples include: classrooms, and the general lighting allowance for portions of the tailored lighting method.   

Related to the development of the lighting wattage allowance LPDs, are the updates to the calculation of installed wattage in Section 130.0(c).  

  • Remove the 50 Watt minimum for downlights. 

There are proposed changes to Section 130.1 to remove requirements and exemptions for legacy lighting products as these are now outdated. 

Multi-Zone Occupancy Sensing in Large Offices 

This proposal would harmonize with the 2018 IECC and require multi-zone occupancy sensing of general lighting in office spaces greater than 250 square feet, or “large offices. This would require that large offices are divided up into smaller control zones controlled by occupancy sensors (maximum control zone size is 600 square feet in the 2018 IECC, but it could be a different size for Title 24, Part 6 based on the cost effectiveness analysis).  When the subzones are unoccupied, each subzone must dim the lights to no greater than 20 percent of power or light, and when all subzones are unoccupied in the large office, the lights must be completely shut off.  The benefits of this control include:  

  • Saves more energy than the current minimally compliant shut-off control (timeclock).  
  • Less disruptive to occupants that might stay after hours and have to walk over to enable the override control. 
  • Enables the occupied standby HVAC control that resets the thermostat and shuts off ventilation to the space when the entire space is unoccupied.  Less ventilation air is required to be conditioned.  
  • Simplifies the standard.  Depending upon the occupancy control subzone maximum size selected for the mandatory control this would displace the power adjustment factors (PAFs) for occupant sensing controls in large open plan offices. 

Submeasures Moved to Future Code Cycles

The Statewide CASE Team is no longer pursuing the proposed changes listed below as it was determined that they did not meet the Energy Commission’s requirements for market readiness, technical feasibility, cost-effectiveness, or enforceability at the time they were considered.

Networked Lighting Controls

This submeasure would provide power adjustment factors or allow a tradeoff to mandatory or prescriptive requirements to encourage the deployment of networked lighting controls. The Statewide CASE Team is not pursuing this measure due to a lack of information needed to estimate incremental energy savings and calculate the power adjustment factors.

To support ongoing research and future code cycle consideration, additional information on nonresidential networked lighting controls can be submitted to the Statewide CASE Team through info@title24stakeholders.com. This measure may be pursued through CalGreen (Title 24, Part 11).

Materials that the Statewide CASE Team developed when investigating this code change for the 2022 code cycle will be moved to the Future Code Cycles section of this website. Follow this link to find materials on nonresidential networked lighting controls.

Relevant Documents

Measure proposals, supporting documents, and other outside references will be made public as they become available.

Round Two Utility-Sponsored Stakeholder Meeting Materials

Round One Utility-Sponsored Stakeholder Meeting Materials

Provide Feedback

This measure description will be updated as research is developed to support the 2022 code cycle. For questions or suggestions, email info@title24stakeholders.com. 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.