This research monitored 56 all-electric homes post-CFL/LED swaps, isolating lighting impacts amid plug loads.
Targeted 56% bulb replacement (incandescents to LEDs/CFLs), focusing on fixtures; sub-analysis on >20% change homes. Normalized for weather/controls.
Spring/summer installs minimized seasonal bias; 30-day monitoring. Challenge: Isolating lighting from fans/plugs; deduced via total subtraction.
Normalized 1.2 kWh/day (16.9%) for all; 1.5 kWh/day (19.9%) for deep retrofits. October sub-sample: 2.5 kWh/day (29%), showing seasonal variance.
Statistical significance (90% CI) confirms reliability; correlation with replacement % (r=0.5).
Lesson: T-stat tests validate; prioritize high-use rooms for max ROI, using tools like Home Energy Saver for baselines.
Last updated on November 8, 2025
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