|Average wattage (W)||53||68||19||37||350||12||11|
|Average usage (h/day)||104||12.4||10.4||11.1||11.1||20.8||14.8|
|Average number of lamps per building||14.1||8.7||39.3||301||6.3||6.9||0.1|
SOURCE: DOE (2012).
TABLE 6.6 Commercial Electricity Consumption, Due to Lighting, As Estimated by the Committee
|Year||BAU (TWh)||Scenario 1 (TWh)||Scenario 2 (TWh)|
NOTE: TWh = terawatt-hours; BAU = business as usual.
been corrected for the 2011 edition of CBECS. Without further support for data collection, policy makers and the lighting industry generally are left to rely on a nearly decade old survey data. The results of the survey, in either case, because of data limitations and the frequency of collection, are of little use to energy modelers and policy makers. EIA could ask consumers to fill out tables similar to Table 6.7, which uses the room types from DOE’s 2010 Lighting Market Characterization study (DOE, 2012). The list of data and questions provided below is illustrative and not exhaustive.
Questions related to lighting use that EIA might consider asking CBECS survey respondents include the following:
1. The percentage of the square footage in buildings that are lighted when the building is operating under normal use conditions.
2. The best estimate of the percentage of square feet lighted for each room (space) identified in Table 6.7.
3. The percentage of room area in square footage, lighted during off hours—hours when the building is not in normal operating use, excluding the space lighted by emergency lighting.
4. The types of lighting used to light space in the building: fluorescent lighting other than CFLs; CFLs; incandescent lamps other than halogen lamps; halogen lamps; high-intensity discharge (HID) lights, such as high-pressure sodium, metal halide, or mercury vapor; and other types of lighting.
5. The type of lamp if “other” is identified in (4) above.
6. Questions about the percentage of floor space lighted by the types of lighting just identified, keeping in mind the following:
a. The lighted portion of the floor space, so these percentages must add up to at least 100, but because more than one type of lamp can light the same area, it is also possible for them to add up to more than 100; and
b. The percentage of the lighted area in the building lighted by each lighting technology, e.g., fluorescent lighting; compact fluorescent lighting; incandescent lamps; halogen lighting; HID; and other lighting types.
FINDING: Without appropriate data on consumer lighting use, it is difficult to establish an appropriate baseline of energy use in lighting and benchmark energy lighting efficiency.
RECOMMENDATION 6-6: The Energy Information Administration should collect data on energy demand for lighting through the Residential Energy Consumption Survey, the Commercial Energy Consumption Survey, and the Manufacturing Energy Consumption Survey. These efforts need to be pursued on a consistent basis and should consider adding questions that would increase the accuracy and usefulness of the data. In addition, detailed lighting market characterization based on nationally representative surveys, such as the 2001 Lighting Market Characterization from the Department of Energy, need to be pursued every 5 years. It would be helpful if these surveys are available before this study is updated in 2015.
Annualized Life-Cycle Cost of Lighting
The committee has developed a first-order comparison of the consumer life-cycle costs of light. The following assumptions are used: a retail electricity price of 0.11$/kWh and a 10 percent discount rate reflecting the implicit discount