Light and experience: Lecture 2

Question 1

What does “I like the lighting” mean?

Answer 1

1. Daylight
2. Luminaire
3. Beam of luminaire
4. Light from luminaire
5. Light in the whole room

Question 2

What are the modes of appearance?

Answer 2

Level 1: located versus non-located (shape and size)

Level 2:
Illuminant or illumination, and:
Object-surface or object-volume

Question 3

Non-located illuminant

Answer 3

Sky

Question 4

Non located illumination

Answer 4

Light in room

Question 5

Located illuminant

Answer 5

Desk light

Question 6

Located illumination

Answer 6

Beam of light

Question 7

Located object-surface

Answer 7

Wall

Question 8

Located object-volume

Answer 8

Glass vase

Question 9

What is Gloom

Answer 9

Inadequately lit or underlit even though the measured task area is more than adequate according to standards

Question 10

By what is Gloom produced?

4 reasons

Answer 10

1. Low surround luminaires/luminances
2. High task illuminances, low periphery
3. Small details in periphery obscured
4. Adaptation luminances in mesopic range

Question 11

Link between light and visual experience (Flynn et al)

Dimensions

Answer 11

Evaluative
Perceptual
Spaciousness

overhead — peripheral
bright — dim
uniform — non-uniform

Question 12

Atmosphere perception by Vogels et al.

Answer 12

Coziness
Liveness
Tenseness
Detachment

Question 13

When is the probability of sparkle high?

Answer 13

Solid angle of 0.5….
Luminance of 2000 cd/m2 exterior
Luminance of 4000 cd/m2 interior

Question 14

What happens when luminance or solid angle are increased?

Answer 14

GLARE

Question 15

What happens when luminance is decreased?

Answer 15

Dull scene

Question 16

Why is daylight often preferred over electrical lighting?

Answer 16

High spatial, spectral, and temporal variability

Question 17

More luminance variability increases:

Answer 17

Cheerfulness, pleasant, bright