GSA
Courtroom Lighting Criteria Evaluation
Task 1 Report
Vertical Illuminance (Fc)
5.2.6
Design Analysis
Horizontal Illuminance (Fc)
The indirect approach and light colored wall
120
surfaces in this room make it one of the best
110
spaces of those surveyed with regards to visual
100
The addition of daylight into the space is
90
well-received and appreciated by the
users, and contributes to the bright feeling
80
of the room.
70
The dark colored wood panelling is kept at
a low level, allowing the high reflectance
60
wall surfaces to help light the room evenly.
50
Even though this room has the lowest
installed power density and lowest
40
measured illuminance levels, it feels much
brighter than the other courtrooms. This
30
can be compared to the Islip courtroom,
20
which has a very bright ceiling but dark
walls, which contribute to the ceiling being
10
seen as a glare source and the room
feeling dim.
0
The high ceilings allow the indirect pendant
luminaires to be hung low enough to
evenly light the ceiling, which reduces hot
spots and glare.
The plane of the bottom of the pendants is
LPD w/sf
3.2
still higher than most of the other sites
Limit w/sf
1.9
surveyed.
1
2
3
4
5
The uniformly lit wall surface provides even
Subjective Rating
5
4
3
2
1
Satisfaction?
NY
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Issue March 1, 2006