The Department of Energy (DOE) has published the “Residential Lighting End-Use Consumption Study: Estimation Framework and Initial Estimates,” which focused on developing new estimates of residential lighting usage and energy consumption at the national and regional levels, household characteristics, lamp characteristics and the particular room within a home.
Michael Poplawski, Senior Lighting Engineer, DOE Solid-State Lighting Program, says the purpose of the report was not to provide interpretation and analysis of the estimates, but rather to describe the statistical methodology used to generate the estimates. The real goal of the study is contained in the companion spreadsheet, which contains over 16,000 estimates organized so as to allow users to easily filter down to what they are most interested in. The DOE hopes to gauge how these finer and more accurate estimates will be used through follow-up engagements, especially where relevant to furthering the deployment of LEDs.
“We’re hoping that the study 1) gives product developers a better idea of how to market, 2) drives discussion within energy-efficiency organizations and utilities about the estimates that they’re using, and 3) sows the seeds that could lead to some kind of recurring effort to figure out how people are consuming lighting energy in homes,” Poplawski says.
Statistics like what areas of the home use the most energy, and in which regions of the country lighting energy consumption is the highest, could provide valuable insight for lighting retailers as they buy product, create promotions or even merchandise in their stores.
Several key findings are highlighted in the study’s report:
-The estimated daily usage per lamp averaged 1.6 hours for all lamps in the U.S., with regional averages ranging between 1.4 and 1.6 hours. The average estimated hours of use (HOU) per lamp was lowest in Missouri and Virginia (<1.5 hours/day) and highest in Massachusetts, New York, Texas, Oklahoma, Arkansas, and Louisiana (>1.6 hours/day).
-Exterior lamps averaged close to 3 HOU/day, while hallway lamps averaged less than 1 hour. Lamps in bedrooms, bathrooms, living rooms, and kitchens consumed the most energy, on average, of all spaces within a home.
-Massachusetts, New York, and California had the lowest annual household lighting energy consumption, each averaging fewer than 1,500 kWh per home, while Idaho, Montana, Utah, Wyoming, Missouri, and Arizona had the highest, each averaging over 2,100 kWh—considerably more than the national average of just over 1,700 kWh, and driven in part by the typically higher percentage of single-family homes in those states.
The report, companion spreadsheet, and some state-level results are available online.