GSA
Courtroom Lighting Criteria Evaluation
Task 1 Report
4.4
ASHRAE/IESNA 90.1
The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)
in coordination with the IESNA produces standards for lighting power density in buildings.
Lighting power density is the amount of installed lighting power per unit area of a building
and is expressed in watts per square foot. ASHREA/IESNA Standard 90.1-2004 indicates
the minimum federal requirement for energy efficiency in new federal courthouses.
The standard states that the maximum allowed lighting power density in courtrooms is 1.9
w/sf. This is lower than the previous standard of 1999, which was 2.1 w/sf.
An energy analysis of the courtrooms in this study is contained in the report by PNNL.
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Issue March 1, 2006
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