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Nonresidential Indoor Lighting

Measure Description

This CASE Report for nonresidential indoor lighting consists of two submeasures: networked lighting controls and update lighting power densities.

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. Networked lighting controls can readily be used to meet the current indoor lighting control requirements while providing advanced features for more efficient management and long-term energy benefits, including easier demand response integration, enabling granular controls, flexible control interactions, easily adapting to space usage and occupancy changes to ensure sustainable savings throughout the life of the system, and energy reporting for verifying energy usage, informing operation efficiency, and paving the way to the outcome-based code compliance pathways. The networked lighting controls requirements will be structured so designers are awarded for taking advantage of the advanced features of networked lighting controls. 

Update Lighting Power Densities

This measure updates indoor lighting power densities (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).  

  • What is the wattage of constant light output (CLO) drivers. 
  • Addressing modular systems, including PoE and DC systems that can be expanded at any time post-installation without requiring an electrician for adding luminaires. 
  • Clarify the 50 Watt minimum for downlights and what are the alternatives 

Occupant Sensor Control in Open Offices 

This proposal would harmonize with the 2018 IECC and require multi-zone occupancy sensing of general lighting in open plan offices.  This would require that open plan offices are divided up into relatively small subzones controlled by occupancy sensors (maximum subzone size is 600 sf in the IECC but could be a smaller size when evaluated for T-24).  When the subzones are unoccupied, each subzone must dim lights to no greater than 20% of power or light, and when all subzones or unoccupied in an enclosed space, 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 controls 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 PAFs for Occupant Sensing Controls in Large Open Plan Offices  

Relevant Documents

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

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.