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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
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.
Coefficient of utilization (CU)
25
Ratio of fixture lumen output per wall of lamp input
Luminaire efficacy rating (LER)
26
Effect of temperature and voltage variations, dirt accumulation on luminaires and room services, lamp output depreciation, maintenance conditions.
Light loss factor (LLF)
27
The amount of light produced versus the power input (lumens/watt)
Efficacy
28
Difference and illumination level between one point and nearby points.
Contrast
29
Theoretical sphere surrounding an object being illuminated with light, cast evenly and illuminating any shadows and reflected bright spots
Equivalent spiracle illumination (ESI)
30
Measure of the effectiveness of the stores to make colors "right" to the viewer. The best possible rating is 100. 85+ is good
Color rendering index (CRI)
31
A characteristic of visible light where it's color reveals its temperature.
Color temperature (K)
32
Intensity (I) / distance (d) ^2
Illumination (E)
33
Controls the amount of brightness admitted
Iris
34
Sensing device
Retina
35
Sense color
Cones
36
Since black-and-white
Rods
37
Visible light has a wavelength of about:
380–740 nm
38
The dormant wavelength determines
The perceived color
39
At the lower end of the visible light spectrum
Infrared
40
At the higher range of the visible light spectrum
Ultraviolet
41
Color temperature is when a light absorbing body is heated, it first glows …
First close to Fred, and orange, until it becomes blue/white hot.
42
Clear glass has a coefficient of transmission level of
85%
43
Frosted glass has a coefficient of transmission level of
70-85%
44
Contrast and brightness ratio: Task to adjacent surroundings
1:1/3
45
Contrast and brightness ratio: Task to more remote darker surfaces
1:1/5
46
Contrast and brightness ratios: Task to more remote lighter surfaces
1:10
47
Sunlight footcandles:
10,000 footcandles
48
Full daylight footcandles
1000 footcandles
49
Overcast day footcandles
100 foot candles
50
Very dark day footcandles
10 footcandles
51
Twilight footcandles
One footcandle
52
Full moon footcandle
.01 footcandles
53
Minimum footcandles for emergency egress
One footcandle
54
General office work footcandles
50 foot candles
55
Footcandles for intricate tasks
150 foot candles
56
Candles for medium contrast tasks | Drafting
75 footcandles
57
If you surface will exhibit uniform brightness the spacing between light sources does not exceed approximately__their distance from the material.
1.5 times their distance from the material
58
Photometric readings are usually taken at the height of:
The working plane because this approximate height to typical visual tasks
59
Permanent supplementary artificial lighting of interiors (PSALI)
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
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.
Point grid method
61
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.
Zonal cavity method
62
Factors included in the zonal cavity method:
``` Light loss factors: Lamp lumen depreciation Ballast factor Luminaire dirt depreciation Room surface dirt depreciation ```

Building Systems (37 decks)

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