| Vital Signs
Project: Daylighting in Three Libraries
(Overview) (Method) (Survey) (Mt. Airy) (Michigan) (Exeter)
(Syllabus)
Phillips Exeter Academy Library
(Exeter Intro) (Exeter Model Study) (Exeter Survey) (Exeter Student Evaluation)
Survey
LIBRARY USER'S LIGHTING QUALITY SURVEY
Building: Phillips Exeter Academy Library
Date of survey: Nov. 2, 1996
Time of survey: throughout the entire day and early evening
Outside sky conditions: varies from sunny to partly cloudy through twilight
Inside luminance (at desk top):
(atrium center) - low reading @ 20 fc (no variation from daylight flux) (reading carrels)
- varied from 100 fc upwards (below 100 fc, electric lights switched on)
Occupant comfort survey results
|
Daylight |
|
Electric
Light* |
|
| Number of users surveyed |
18 |
|
8 |
|
| Overall the lighting is comfortable |
89% |
|
100% |
|
| The lighting is uncomfortably bright for the tasks that I perform |
11% |
|
0% |
|
| The lighting is uncomfortably dim for the tasks that I perform |
6% |
|
13% |
|
| The lighting is poorly distributed here |
17% |
|
13% |
|
| The lighting causes deep shadows |
17% |
|
13% |
|
| Reflections from windows/skylights hinder my work |
11% |
|
0% |
| Direct glare from unprotected windows/skylights hinders my work |
17% |
|
13% |
| Brightness from direct sunlight hinders my work |
33% |
|
Not App |
| The electric lights flicker throughout the day |
22% |
|
38% |
How does the lighting compare to workplaces in other buildings?
| % who say "worse" |
17% |
13% |
| % who say "about the same" |
50% |
63% |
| % who say "better" |
33% |
25% |
Percentage of occupants able to read text comfortably at:
| 4 pt. type and larger |
89% |
100% |
| 6 pt. type and larger |
100% |
|
*In Interior reading rooms (ceiling luminaires)
NOTES:
[1] Two respondants who indicated "lighting is not comfortable" mentioned direct
sun on carrels, and also mentioned the movable panels that block the sunlight.
[2] Two respondants said they prefer to sit at electrically lit spaces due to daylight
brightness/glare sensitivity.
The next section presents a "self-evaluation of lessons learned" written by one
of the students who undertook the study of the Phillips Exeter Academy Library.
|
