I ran across the Department of Energy report on Lighting. It just came out and it is a survey or a census of Lighting in 2010. The report is called 2010 U.S. Lighting Market Characterization and it can be found on the DoE’s Solid State Lighting Technical Reports page. It’s a long report but it is full of charts and graphs. It gives you a good looking at what is lighting this country. There are still a lot of inefficient lamps in the field- mostly incandescent lamps in residential homes. Business and Industry has done a good job of upgrading their lighting.
2010 U.S. Lighting Market Characterization
The chart breaks down the usage but lamp type and Sectors: Residential 5.8 billion, Commercial 2.1 billion, Industry 0.1 Billion, and Outdoor 0.2 billion lamps for a total of 8 billion light bulbs in use in the United States.
This chart shows average hours of operation. One reason the use of incandescent lamps isn’t too troubling are the low hours of use. It doesn’t pay to use expensive lamps if they’re rarely on. Residential 1.8 hours, Commercial 11.2 hours, Industry 13.0 hour, and Outdoor 11.7 hours per year.
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Two graphs that show usage of electricity and light output.
Table C2 shows Lighting Efficacy Assumption, which gives a good snapshot of how efficient certain lamps are as of 2010. Note all of these lamp types are getting more efficient with the exception of Incandescent lamps. LEDs are making the most progress.
System Efficacy Assumptions (Lumins per Watt – higher is better)
|General Service – A-type||12.9||12.4||11.9||12.8|
|General Service – Decorative||10.9||10.9|
|Low Voltage Display||16.8||18.1||18.0|
|General Service – Screw||53.0||54.4||53.3||53.3|
|General Service – Pin||59.1||58.4||68.6||58.4|
|T8 Less than 4ft||55.4||71.0||71.4||70.6|
|T8 Greater than 4ft||87.0||80.5||78.5||80.3|
|T12 Less than 4ft||51.8||56.1||48.5||55.8|
|T12 Greater than 4ft||74.5||77.1||78.1||77.2|
|High Intensity Discharge||62.4||75.2||76.7||74.6||75.1|
|High Pressure Sodium||70.1||107.5||104.7||83.6||86.9|
|Low Pressure Sodium||143.5||89.2||92.1|