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NORDIC LIGHT & COLOUR
113
Which room has the highest light level (from brightest to darkest,
in descending order)?
Yellow and Red rooms were evaluated equally bright (25% cor-
respondingly), see Figure 16. The Grey room was chosen as the
darkest (31.25%). The rest of the rooms were placed in medium
positions. However, according to the statistical analysis the
differences were small and not statistically significant (Fr =
3.9612, critical value = 9.49,
∂
= 0.05, df = 4).
Which room has the more comfortable lighting (from the most
comfortable to the least comfortable)?
According to evaluation, the Blue room has the most comfor-
table lighting (28.13%), the Green room has less comfortable
lighting (28.13%), the Red room has the least comfortable
lighting (31.25%), Figure 17. Other rooms were placed in
medium positions. Results showed no significant differences
between the rooms (Fr = 6.648, critical value = 9.49, a = 0.05, df
= 4).
Your personal preferences among these rooms (in lighting). Why?
Results are shown in Figure 18. According to statistical analysis
there was no significant difference between the rooms.(Fr =
3.5986, critical value = 9.49, a = 0.05, df = 4).
However, it is interesting to analyze the subjects` spontane-
ous explanations which supported their decisions. Even if the
question was about preferences in lighting, most of the people
commented the colour of the room (examples of the explanati-
ons: grey is boring; I prefer non-chromatic interiors; red is not
suitable for the walls). Others were not concentrated on colour
itself but still estimated the atmosphere in the room as cold or
warm (examples of the comments: colour affected the tempe-
rature of the room, but not light level; I prefer warm interiors).
This observation illustrates how strongly one`s perception of
the interiors depends on colour.
How much colour affected your perception of light level?
The last question about power of influence of colour on light
level perception also showed interesting results: 87.5% of the
participants considered that colour affected their perception
of the light level. This effect was stronger for one-coloured
models than for striped rooms.
Perception of the light level in the striped models
Part 1. Spontaneous answers to question about the light level
in the scale model showed that the Yellow/Blue model was per-
ceived as the brightest room, the Red/Green as medium-bright
and the Grey/Blue as the darkest one, see Figure 19.
Part 2.
Which room has the highest light level (from brightest to darkest,
in descending order)?
The Yellow/Blue model was evaluated as the brightest room
by 43.75% of the participants, the Red/Green model was rated
as the medium-bright room(50%) and the Grey/ Blue model
was rated as the darkest room (75%), see Figure 20. Results
showed a highly significant difference between the rooms (Fr =
12.9677, critical value = 5.99, a =0.05, df = 2).
Which room has the more comfortable lighting?
According to evaluation, the Red/Green room was chosen as
a model with the most comfortable lighting by 56.25% of the
participants. The Yellow/Blue room was evaluated as the room
with medium-comfortable lighting (50%). The least comfortable
lighting had the Grey/Blue model (50%), see Figure 21. Further-
more, there was a statistically significant difference between
the rooms (Fr = 7.4666, critical value = 5.99, a = 0.05, df = 2).
Your personal preferences among these rooms (in lighting).Why?
Results are shown in igure 22. According to statistical analysis
there was no significant difference in preferences between the
rooms (Fr = 0.8125, critical value = 5.99,
∂
= 0.05, df = 2).
It is also important to note here that in striped models the
same tendency in room appearance evaluation was observed.
However, the subjects were more concerned with colour rather
than the light in the rooms (example of the comments: Red/
Green reminds me of Christmas, Yellow/Blue reminds me of
summer). The subjects tended to observe the room as a whole
rather by colour or light specifically (example of the notes:
the high contrast between green and pink made the room feel
darker; if the colour feels uncomfortable, the lighting also feels
uncomfortable).
How much colour affected your perception of light level?
Answering the last question 81.25% of the participants consi-
dered that colour affected their perception of the light level.
Luminance maps vs. questionnaires
First, the obtained luminance maps of the scale models
were converted using Photosphere software into false-colour
pictures. In this particular case, the false-colour picture is a
picture that shows specific representation of luminance values.
In other words, the picture becomes a graph where newly as-
signed colours are not important themselves, but each of these
colours pertains to particular luminance values. Furthermore,
all the false-colour pictures were calibrated. The range of the
luminance was set from 10 cd/m2 to 800 cd/m2. It was an im-
portant action to be able to compare luminance patterns of the
images and parallel photos of the rooms.