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4th Year > Lighting Essentials > Flashcards

Lighting Essentials Flashcards

1
Q

The____is typically Used to highlight vertical surfaces and 3 dimensional objects such as artwork, retail displays, and signage.

A

Focal layer

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2
Q

The ___ provides the background lighting that helps create the mood of the space.

A

Ambient layer

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3
Q

Which lighting layer is considered to be the “jewelry of architecture?”

A

Decorative Layer

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4
Q

Which Lighting layer uses fenestrations to light a space?

A

Daylight layer

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5
Q

The ___ layer is used to light specific tasks that are performed in a space.

A

Task Layer

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6
Q

Decorative lighting may be used as ambient light

True or false

A

True

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7
Q

Decorative lighting may not be used as task lighting

True or False

A

False

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8
Q

____ Is an approach whereby only one luminare or a group of similar luminaires is designed to provide all task and ambient lighting.

A

General lighting.

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9
Q

Depending on the complexity of the Room and its design, it is possible to have all of the layers of light represented.

True or False

A

True

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10
Q

Which lighting layer or technique is used in many basic lighting designs for offices, classrooms, stores, and other similar spaces?

A

Focal layer

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11
Q

Of all the technological advances over the past century, nothing has completely altered our lives as much as ____.

A

Electric lighting

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12
Q

Until fairly recently,light was considered primarily in terms of its____.

A

Quantity

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13
Q

Visually perceived radiant energy is the simple definition of____

A

Light

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14
Q

Light____from objects to our eyes allows us to see.

A

Reflected

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15
Q

What wavelength are human eyes most sensitive to?

A

550 nm

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16
Q

Light that features all of the visible wavelengths in roughly equal amounts appears____. (Color)

A

White

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17
Q

We see the color of am object because the object absorbs that color and reflects other colors.

True or False

A

FALSE

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18
Q

The color temperature system is based on the color changes of a theoretical black body radiator as it is heated from a cold black to a white hot state.

True or False

A

True

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19
Q

Color temperature fails to indicate anything about how a given light source will ____ colors.

A

Render

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20
Q

____ assesses the impact of different light sources on the perceived color of objects and surfaces.

A

Color Rendering Index

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21
Q

In general, a low CRI figure means a light source will render colors well.

True or False

A

False

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22
Q

CRI is an average of ____(#) different colors.

A

8

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23
Q

____ Is the most common way to express the energy efficiency of a light source , and it is expressed as a ratio of the number of lumens a lamp produces to each Watt of power it consumes.

A

Efficacy.

24
Q

In today’s energy conscious world, a lamp’s ____ performance is one of it’s most critical characteristics.

A

Lumens per watt (LPW)

25
Q

The light output of all lamps will deteriorate gradually over time.the rate of this deterioration is known as lumen maintenance.

True or False

A

TRUE

26
Q

____is the measure of the intensity of a light source in a specific direction.

A

Candlepower

27
Q

____is the measure of the light that falls on a surface,and is expressed in lumens per square foot.

A

Footcandle

28
Q

A ____ Is a lamp or fixture that is relatively small compared to the area It is lighting, And it has the potential to direct a concentrated beam of light on a specific surface or object.

A

Point source

29
Q

The pattern of light delivered by reflector lamps is often described in terms of____.(2 things)

A

Beam angle and Field Angle

30
Q

The halogen gas inside a halogen lamp causes the evaporated tungsten to redeposit on the filament.

True or False

A

True

31
Q

Light is produced in a fluorescent lamp by passing an electric arc between tungsten cathodes in a tube filled with a ____ and other gases.

A

Low pressure mercury vapor.

32
Q

The fastest growing application for fluorescent technology today is ____.

A

Compact fluorescent lamps

33
Q

An inductively coupled electrodeless electronic lighting system uses fluorescent light technology combined with magnetic induction to produce light.

True or False

A

True

34
Q

Because LEDs run on direct current,they must be operated with a ____power supply.

A

Transformer-type

35
Q

White led’s are actually blue led’s with a phospher coating which converts a portion of the blue light to yellow.

True or false

A

True

36
Q

What are 2 broad categories that fluorescent and HID ballasts fall into.

A

Electronic and Magnetic

37
Q

List three fluorescent lamp starting and operating methods

A
  1. Instant Start
  2. Rapid Start
  3. Programmed rapid start
38
Q

Fluorescent and HID dimming may be used____ systems to compensate for available natural light.

A

Daylight harvesting

39
Q

The acronym DALI stands for….

A

Dynamic addressable lighting interface

40
Q

A____ shows the precise color output of a given light source by charting the level of energy present at each wavelength across the visible spectrum.

A

Spectral power distribution curve (SPD)

41
Q

What are 4 considerations or concepts to applying lighting technology that you should understand?

A
  1. Matching lamps to applications
  2. color characteristics (how important is color rendition)
  3. service life (how long will a particular lamp last)
  4. the impact of energy policies
42
Q 
Fluorescent lamps are about\_\_\_\_%more efficent than incandescent lamps
A.100%
B.200%
C.300%
D.400%
A

D.400%

43
Q 
CRI describes the\_\_\_of the light on a scale 0 to 100,with 0 being poor color rendering and 100 providing perfect color rendering.
A. Efficiency
B. Energy
C. Quality
D. Temperature
A

C. Quality

44
Q 
All white light sources can be evaluated by\_\_\_\_and CRI.
A. Color temperature
B. Efficiency
C. Quality
D. Temperature
A

A. Color temperature

45
Q 
Natural light is considered to have a CRI of\_\_\_\_
A.25
B.50
C.75
D.100
A

D.100

46
Q

Natural daylight maintains a constant color temperature

True or False

A

False

47
Q

List 4 things that affect the color temperature of daylight?

A
  1. Air pollution
  2. Seasons
    3 weather
  3. Viewing angle
48
Q 
Standard incandescent lamps use tungsten filaments that generate a white light with a color temperature of about\_\_\_\_.
A.1500 k
B.2700 K
C.3500 k
D.4100K
A

B.2700k

49
Q 
What color temperature range is recommended for general lighting in office spaces and schools?
A.1500k to 2100k
B.2500 k to 3100k
C.3500k to 4100k
D.4500k to 5100k
A

C.3500k to 4100k

50
Q

All light sources reduce intensity over time, but some sources also shift in color.

True or false

A

True

51
Q

____is the process by which lamps are operated at less than full light output.

A. Dimming
B. Efficacy
C. Lumen maintenance
D. Task lighting

A

A. Dimming

52
Q 
Efficacy is the\_\_\_\_of a light source and is measured in lumens per watt.
A. Energy efficiency 
B. Light level
C. Power output
D. Temperature range
A

A. Energy efficiency

53
Q

Incandescent lamps are more efficacious than fluorescent lamps.

True or false

A

False

54
Q 
If a \_\_\_cost analysis is completed, the efficacy of the lamps becomes very important.
A efficacy
B. Initial
C. Life cycle
D. Operating
A

C. Life cycle

55
Q

Lamp life is a measure of the total operating time at which___% of a large sample group of lamps are expected to fail.

A

50

4th Year (13 decks)

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