(2) Colors of Light & Artificial Lighting Flashcards

1
Q

the ability to distinguish and interpret different wavelengths of visible light

A

color perception

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

the ability to distinguish fine details; it is the “keenness” of vision that is necessary to perform tasks such as reading, writing, drafting, sewing, or surgery

A

visual acuity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

a device that generates light

A

lamp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

a complete lighting unit, which consists of a lamp (or lamps), lamp socket(s), any lenses, refractors, or louvers, any ballast (or ballasts), and the housing

A

luminaire

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

the luminaire less the lamp(s); it includes the structural parts of a luminaire including any lenses, mounting supports, wiring, and ballasts, but does not include the lamps

A

light fixture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

_____ + _____ = luminaire

A

lamp + fixture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

the measure of the perceived power of light expressed in lumens (lm)

A

luminous flux

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

the amount of light shaking a 1.0 ft2 surface that at all points is held one foot away from the flame of a standard candle (roughly one candela of intensity)

A

lumen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

the SI unit of luminous intensity—that is, the power emitted by a light source in a particular direction

A

candela (cd)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

the ratio of the light output of a light source (a specific lamp) to the electrical energy consumed to produce that light source

LPW = (light output (lm) /(power input (W)

A

luminous efficacy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

color of lamp rating, Kelvin (K)

A

correlated color temperature (CCT)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

color temperature less than about 3500 K

A

warm lighting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

color temperature greater than about 5000 K

A

cool lighting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

color temperature of the lamp is between temperatures of 4500 and 6500 K

A

daylighting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

color temperature of warm light

A

3000 K

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

color temperature of neutral light

A

4500 K

16
Q

color temperature of white light

A

6000 K

17
Q

a method of numerically comparing the color distribution of a light source to a reference lamp

A

color rendering index (CRI)

18
Q

a graphic presentation of the quantities of light emitted by a lamp by wavelength component

A

spectral power distribution curve

19
Q

a lamp is its median life expectancy, expressed in hours; it is the cumulative time that lapses before 50% of a representative group of lamps has failed and the other lamps in the group continue operating

A

rated life