Memo: Clarifications to the 2020 Report: “Energy Savings from Networked Lighting Control (NLC) Systems With and Without LLLC”

The memo addresses clarifications to the 2020 “Energy Savings from Networked Lighting Control (NLC) Systems With and Without LLLC” report, focusing on challenges in interpreting its findings for energy efficiency (EE) programs. Key updates include refined clarification of the definition of luminaire-level lighting controls (LLLC) used in the report, elaborated explanations on several important aspects of the control savings factors (CSFs), and distinguishing the calculation methodology between high-end trim savings and other control strategies (occupancy sensing and daylight harvesting). The memo emphasizes that the documented CSFs reflect average savings across a diverse set of projects, where optimal programming varied, and highlights considerations for small sample bias in evaluations. Building-specific CSFs and their limitations are explained, and the memo differentiates findings from a related redesign study to avoid misinterpretation. Lastly, an updated executive summary and errata sheet correct clerical errors, reaffirming that NLC systems with LLLC offer higher energy savings potential but encouraging ongoing updates as technology and datasets evolve.