GSA
Courtroom Lighting Criteria Evaluation
Task 1 Report
Vertical Illuminance (Fc)
5.5.6
Design Analysis
Horizontal Illuminance (Fc)
The main issue with this design was the original
120
installation of metal halide direct downlights,
110
contrary to the Design Guide. These downlights
are problematic because of their poor color
100
rendering, excessive ballast hum, and long re-
strike time once they are turned off.
90
Both the original and revised design have
80
illuminance levels that are on the high end
o teD s nG i sag ta g swt
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g
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h
70
the exception of the witness and podium
60
areas.
Although there is a significant amount of
50
dark wood panelling, there are parts of the
40
walls that have lighter surfaces, which
improves the overall brightness of the
30
space.
20
Although the general light levels and visual
brightness in the room are relatively good
10
for both schemes, the floating ceiling over
the judge blocks a good deal of light,
0
making that area seem darker, which can
be seen in the luminance map. This area
should ideally have more emphasis, not
less.
Even though the courtroom lighting is
LPD w/sf
5.3
predominantly downlighting, similar to the
Limit w/sf
1.9
Tallahassee courtroom, having the indirect
1
2
3
4
5
component in the center of the room
improves overall brightnesses and lightens
Subjective Rating
the ceiling. This eliminates what is
5
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o
n ae h cv f t f
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4
downlit rooms where the ceiling is dark.
3
2
The deficiencies of the metal halide
1
scheme were significant enough that the
Tampa courthouse is revising all of the
courtrooms as funds become available so
that they have compact fluorescent lighting
instead of metal halide.
Note: The table to the right shows data for the
revised compact flourescent lighting scheme.
Refer to the table in Section 6 for the original
metal halide lighting scheme.
Satisfaction?
NY
Page 27
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Issue March 1, 2006
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