GSA
Courtroom Lighting Criteria Evaluation
Task 1 Report
Vertical Illuminance (Fc)
5.1.6
Design Analysis
Horizontal Illuminance (Fc)
When compared with the other courthouses
120
surveyed, the district courtroom at the Moynihan
110
courthouse was a relatively successful lighting
scheme. Several factors worth noting with
100
regards to this lighting design include:
90
Daylight improves the general quality of
light in the space and connection to the
80
outside, however better shading systems
could have been integrated to block
70
sunlight when it enters the room.
60
There is a high amount wood wall surfaces
that have a very low reflectance. These
50
cause a high degree of contrast with the
ceiling, and makes the room appear
40
dimmer than it is due to eye adaptation.
30
This high degree of contrast is confirmed in
the luminance maps.
20
The directional recessed downlights
10
provide a significant amount of light on the
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0
luminance than the walls even though they
have a lower reflectance.
Illuminance levels are slightly below the
design guide and IESNA recommendations
in most task areas.
LPD w/sf
3.6
Wallwash luminaires at the front of the
Limit w/sf
1.9
room over the judge are fairly ineffective
1
2
3
4
5
due to the low reflectance and specularity
of the wood panelling. This is confirmed by
Subjective Rating
the minimal highlights in the luminance
5
map image.
4
3
2
1
Satisfaction?
NY
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Issue March 1, 2006
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