GSA
Courtroom Lighting Criteria Evaluation
Task 1 Report
2
Methodology
Our study was focused on Federal District courtrooms. In each courthouse, we visited a
typical district courtroom and took the following measurements:
Illuminance measurements (both horizontal and vertical) at key areas, including the
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measurements were taken with a Minolta T-10 illuminance meter.
Luminance measurements. By using a software algorithm to determine a digital
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courtroom were taken with a Canon EOS-20D digital camera with 28-80mm lens.
These were compiled to generate a luminance map of the space. The values in the
luminance map were spot checked for each viewpoint with a Minolta LS-100
luminance meter.
In each courtroom, we also noted the type of lighting control provided, as well as the type
of luminaires installed if they significantly affected the quality of light (good or bad).
Where possible, we spoke with the people that used the courtrooms to gather their
opinion of the lighting. Where courtrooms have had changes to the lighting system
since its initial installation, we measured both before and after scenarios. We also
measured different lighting scenes where it was deemed appropriate. (Lighting
scenes refers to the levels to which different luminaires in the courtroom are dimmed
or turned on or off.)
2.1
Energy Analysis
During our study, we worked with the Pacific Northwest National Laboratory (PNNL) to
determine the energy use of the lighting installation in each courtroom. The analysis of
LPD for courtrooms is contained in the report by PNNL.
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Issue March 1, 2006
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