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Building Systems > PDX_23_Lighting Vocabulary > Flashcards

PDX_23_Lighting Vocabulary Flashcards

0
Q

The direct light that falls on a service

A

Incident light

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1
Q

Electromagnetic radiation wavelength seen by the human eye

A

Light

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2
Q

Light that passes through a surface, all other is reflected or absorbed

A

Transmitted

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3
Q

Material that allows for an image to pass through (glass)

A

Transparent

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4
Q

Material that changes an image while allowing it to pass through (lens)

A

Refraction

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5
Q

Material that allows light to pass through, but not an image (frosted glass)

A

Translucent

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6
Q

Material that bounces a light off

A

Reflective

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7
Q

Material that reflects or absorbs all light

A

Opaque

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8
Q

The ratio of the total transmitted like to the total incident like represented as a percentage

A

Coefficient of transmission

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9
Q

The ratio of total reflected light to total incident light expressed as a percentage

A

Reflectance coefficient

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10
Q

Light bouncing off a material

A

Reflection

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11
Q

Results from a smooth polished surface like a mirror. The angle of incidence equals the angle of reflection.

A

Specular reflection

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12
Q

Results from a uniformly rough surface. It appears uniformly birth and the image of the source cannot be seen.

A

Diffuse reflection

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13
Q

Makes surface appear to be brighter at the point where the source is shining than in surrounding areas

A

Combined specular

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14
Q

The measure of light in terms of perceived brightness to the human eye

A

Photometry

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15
Q

The amount of light put out by a source

A

Intensity (I)

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16
Q

The measurement for the intensity of a source, and approximately equal to the horizontal output from a single candle

A

Candlepower (CP)

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17
Q

SI unit of luminous flux, a measurement of the total amount of visible light admitted by a source.

One unit of luminous flux uniformly cast on one square foot of area creates an illuminate of one footcandle.

A

Lumen (L)

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18
Q

The flow of light from a source into space

A

Flux (F)

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19
Q

The amount of light arriving at a surface

A

Illumination (E)

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20
Q

The calculated amount of illumination on a surface

A

Footcandle (FC)

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21
Q

The measurement of how bright light leaving an illuminated surface is… It depends on reflectivity or transmittance

A

Luminance

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22
Q

The density of limitless energy expressed as lumens per unit area

A

Illuminance

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23
Q

Unit of luminance or brightness

A

Lambert

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24
Q

Ratio between lumens reaching the working plane in a specific space and the lumens. Typically provided by the luminaire manufacturer, it’s an indication of the effectiveness of the luminaire in delivering light in a given space.

A

Coefficient of utilization (CU)

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25
Q

Ratio of fixture lumen output per wall of lamp input

A

Luminaire efficacy rating (LER)

26
Q

Effect of temperature and voltage variations, dirt accumulation on luminaires and room services, lamp output depreciation, maintenance conditions.

A

Light loss factor (LLF)

27
Q

The amount of light produced versus the power input (lumens/watt)

A

Efficacy

28
Q

Difference and illumination level between one point and nearby points.

A

Contrast

29
Q

Theoretical sphere surrounding an object being illuminated with light, cast evenly and illuminating any shadows and reflected bright spots

A

Equivalent spiracle illumination (ESI)

30
Q

Measure of the effectiveness of the stores to make colors “right” to the viewer. The best possible rating is 100. 85+ is good

A

Color rendering index (CRI)

31
Q

A characteristic of visible light where it’s color reveals its temperature.

A

Color temperature (K)

32
Q

Intensity (I) / distance (d) ^2

A

Illumination (E)

33
Q

Controls the amount of brightness admitted

A

Iris

34
Q

Sensing device

A

Retina

35
Q

Sense color

A

Cones

36
Q

Since black-and-white

A

Rods

37
Q

Visible light has a wavelength of about:

A

380–740 nm

38
Q

The dormant wavelength determines

A

The perceived color

39
Q

At the lower end of the visible light spectrum

A

Infrared

40
Q

At the higher range of the visible light spectrum

A

Ultraviolet

41
Q

Color temperature is when a light absorbing body is heated, it first glows …

A

First close to Fred, and orange, until it becomes blue/white hot.

42
Q

Clear glass has a coefficient of transmission level of

A

85%

43
Q

Frosted glass has a coefficient of transmission level of

A

70-85%

44
Q

Contrast and brightness ratio:

Task to adjacent surroundings

A

1:1/3

45
Q

Contrast and brightness ratio:

Task to more remote darker surfaces

A

1:1/5

46
Q

Contrast and brightness ratios:

Task to more remote lighter surfaces

A

1:10

47
Q

Sunlight footcandles:

A

10,000 footcandles

48
Q

Full daylight footcandles

A

1000 footcandles

49
Q

Overcast day footcandles

A

100 foot candles

50
Q

Very dark day footcandles

A

10 footcandles

51
Q

Twilight footcandles

A

One footcandle

52
Q

Full moon footcandle

A

.01 footcandles

53
Q

Minimum footcandles for emergency egress

A

One footcandle

54
Q

General office work footcandles

A

50 foot candles

55
Q

Footcandles for intricate tasks

A

150 foot candles

56
Q

Candles for medium contrast tasks

Drafting

A

75 footcandles

57
Q

If you surface will exhibit uniform brightness the spacing between light sources does not exceed approximately__their distance from the material.

A

1.5 times their distance from the material

58
Q

Photometric readings are usually taken at the height of:

A

The working plane because this approximate height to typical visual tasks

59
Q

Permanent supplementary artificial lighting of interiors (PSALI)

A

Begins with natural light, does that amount varies during the day, illumination levels vary within a room. Blending daylight and artificial light retains most of the physiological advantages, so lamps should match natural light color.

60
Q

A method of calculating illumination for services not perpendicular to the source. Good for a single fixture or small number of fixtures. Takes into account orientation in distance but ignore surrounding reflection.

A

Point grid method

61
Q

Used to calculate uniform illuminance in the space, based on the uniform distribution of a large number of fixtures. Takes into account reflectivity this space.

A

Zonal cavity method

62
Q

Factors included in the zonal cavity method:

A 
Light loss factors:
Lamp lumen depreciation
Ballast factor
Luminaire dirt depreciation
Room surface dirt depreciation

Building Systems (37 decks)

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