Results of the Spectrally Enhanced Lighting Economics Validation Study
On this page, you will find results from an Economics Validation Study, conducted by the U.S. Department of Energy (DOE), involving three facilities demonstrating the measurable benefits of spectrally enhanced lighting (SEL).
In the field demonstrations, all three buildings had similar pre-retrofit lighting systems consisting of three-lamp, 18-cell parabolic luminaires, although each building had different lamp colors.
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At Pacific Gas & Electric Company's (PG&E) Santa Rosa Service Center, the original overhead lighting was provided by Philips F34T12/SPEC35/RS/EW lamps with magnetic rapid start ballasts (ballast factor 0.88). Lamps in all fixtures were replaced with new Philips F32T8/ADV850/XEW lamps. Ballasts were replaced with electronic instant start ballasts with a ballast factor of 0.77.
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At the U.S. Forest Service building, the original overhead lighting was provided by General Electric F32T8/SP30/ECO lamps and electronic instant start ballasts with ballast factor of 0.88. Lamps in all fixtures were replaced with new GE F32T8/SPX50/HLEC lamps. Ballasts were replaced with electronic programmed start ballasts with a ballast factor of 0.60.
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At Port Hueneme, the original overhead lighting was provided by Philips FO32/741/ECO lamps and electronic instant start ballasts with ballast factor of 0.88. Lamps in all fixtures were replaced with new Sylvania FO30/850XP/SS/ECO lamps. Ballasts were replaced with electronic programmed start ballasts with a ballast factor of 0.71.
The following tables provide a summary of measured results for the 2006 field demonstrations.
| PG&E Santa Rosa Service Center Building | U.S. Forest Service Western Regional Headquarters | Port Hueneme Building 1000 | |
|---|---|---|---|
| Change in connected load (kW) | -45.6%* | -19.8% | -20.5% |
| Est. annual energy savings (kWh) | 44,000 | 60,000 | 37,000 |
| PG&E Santa Rosa Service Center Building | U.S. Forest Service Western Regional Headquarters | Port Hueneme Building 1000 | |
|---|---|---|---|
| Change in horizontal photopic illuminance | -20% | -31% | -15% |
| Change in S/P ratio | +40% | +46% | 19% |
| PG&E Santa Rosa Service Center Building | U.S. Forest Service Western Regional Headquarters | Port Hueneme Building 1000 | |
|---|---|---|---|
| Change in task lighting use | -3.9% (Not statistically significant) |
+2.7% (Not statistically significant) |
-1.5% (Not statistically significant) |
*Approximately half of the savings in the PG&E Santa Rosa building are due to the use of SEL while the other half are attributable to the change from the pre-retrofit T12/magnetic ballast system to the post-retrofit T8/electronic ballast system.
Source: Spectrally Enhanced Lighting Program Implementation for Energy Savings, Field Evaluation, conducted by Pacific Northwest National Laboratory for the U.S. Department of Energy (August 2006) (PDF 4.1 MB). Download Adobe Reader.