| Vital Signs
Project: Daylighting in Three Libraries
(Overview) (Method) (Survey) (Mt. Airy) (Michigan) (Exeter) (Syllabus)
University of Michigan Law Library
(Michigan Intro) (Michigan Model Study) (Michigan Survey) (Michigan Student Evaluation)
Survey
Students conducted two occupant surveys at the library, one at mid-morning and a second
in mid-afternoon.
LIBRARY USER'S LIGHTING QUALITY SURVEY (Morning)
Building: University of Michigan Law Library
Date of survey: March 30, 1996
Time of survey: 9:30-10:30 am (time of measurement)
Outside sky conditions: ranging from 4000 fc (partly cloudy) to 5000 fc (clear)
| Inside luminance (at desk top): |
182 fc avg, upper level |
|
116 fc avg, middle level |
|
90 fc avg, lower level |
Occupant comfort survey results
|
Daylight |
|
Electric
Light* |
|
| Number of users surveyed |
8 |
|
7 |
|
| Overall the lighting is comfortable |
100% |
|
100% |
|
| The lighting is uncomfortably bright for the tasks that I perform |
0% |
|
0% |
|
| The lighting is uncomfortably dim for the tasks that I perform |
0% |
|
29% |
|
| The lighting is poorly distributed here |
0% |
|
29% |
|
| The lighting causes deep shadows |
0% |
|
0% |
|
| Reflections from windows/skylights hinder my work |
25% |
|
Not App |
| Direct glare from unprotected windows/skylights hinders my work |
13% |
|
Not App |
| Brightness from direct sunlight hinders my work |
13% |
|
Not App |
| The electric lights flicker throughout the day |
Not App |
|
14% |
How does the lighting compare to workplaces in other buildings?
| % who say "worse" |
0% |
0% |
| % who say "about the same" |
25% |
57% |
| % who say "better" |
75% |
43% |
Percentage of occupants able to read text comfortably at:
| 4 pt. type and larger |
88% |
100% |
| 6 pt. type and larger |
100% |
|
*In Interior reading rooms (ceiling luminaires)
LIBRARY USER'S LIGHTING QUALITY SURVEY (Afternoon)
Building: University of Michigan Law Library
Date of survey: March 30, 1996
Time of survey: 3:00-4:00 pm (time of measurement)
Outside sky conditions: cloudless 6000 fc
| Inside luminance (at desk top): |
121 fc avg, upper level |
|
117 fc avg, middle level |
|
82 fc avg, lower level |
Occupant comfort survey results
|
Daylight |
|
Electric
Light* |
|
| Number of users surveyed |
14 |
|
15 |
|
| Overall the lighting is comfortable |
100% |
|
87% |
|
| The lighting is uncomfortably bright for the tasks that I perform |
0% |
|
0% |
|
| The lighting is uncomfortably dim for the tasks that I perform |
0% |
|
13% |
|
| The lighting is poorly distributed here |
0% |
|
13% |
|
| The lighting causes deep shadows |
0% |
|
20% |
|
| Reflections from windows/skylights hinder my work |
7% |
|
Not App. |
| Direct glare from unprotected windows/skylights hinders my work |
21% |
|
Not App. |
| Brightness from direct sunlight hinders my work |
14% |
|
Not App. |
| The electric lights flicker throughout the day |
Not App |
|
14% |
How does the lighting compare to workplaces in other buildings?
| % who say "worse" |
0% |
7% |
| % who say "about the same" |
29% |
60% |
| % who say "better" |
71% |
33% |
Percentage of occupants able to read text comfortably at:
| 4 pt. type and larger |
93% |
100% |
| 6 pt. type and larger |
100% |
|
*In Interior reading rooms (ceiling luminaires)
The next section presents a "self-evaluation of lessons learned" written by one
of the students who undertook the study of the University of Michigan Law Library.
|
