Lighting Essentials

Question 1

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

Answer 1

Focal layer

Question 2

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

Answer 2

Ambient layer

Question 3

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

Answer 3

Decorative Layer

Question 4

Which Lighting layer uses fenestrations to light a space?

Answer 4

Daylight layer

Question 5

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

Answer 5

Task Layer

Question 6

Decorative lighting may be used as ambient light

True or false

Answer 6

True

Question 7

Decorative lighting may not be used as task lighting

True or False

Answer 7

False

Question 8

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

Answer 8

General lighting.

Question 9

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

Answer 9

True

Question 10

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

Answer 10

Focal layer

Question 11

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

Answer 11

Electric lighting

Question 12

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

Answer 12

Quantity

Question 13

Visually perceived radiant energy is the simple definition of____

Answer 13

Light

Question 14

Light____from objects to our eyes allows us to see.

Answer 14

Reflected

Question 15

What wavelength are human eyes most sensitive to?

Answer 15

550 nm

Question 16

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

Answer 16

White

Question 17

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

True or False

Answer 17

FALSE

Question 18

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

Answer 18

True

Question 19

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

Answer 19

Render

Question 20

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

Answer 20

Color Rendering Index

Question 21

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

True or False

Answer 21

False

Question 22

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

Answer 22

8

Question 23

____ 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.

Answer 23

Efficacy.

Question 24

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

Answer 24

Lumens per watt (LPW)

Question 25

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

Answer 25

TRUE

Question 26

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

Answer 26

Candlepower

Question 27

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

Answer 27

Footcandle

Question 28

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.

Answer 28

Point source

Question 29

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

Answer 29

Beam angle and Field Angle

Question 30

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

Answer 30

True

Question 31

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

Answer 31

Low pressure mercury vapor.

Question 32

The fastest growing application for fluorescent technology today is ____.

Answer 32

Compact fluorescent lamps

Question 33

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

Answer 33

True

Question 34

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

Answer 34

Transformer-type

Question 35

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

Answer 35

True

Question 36

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

Answer 36

Electronic and Magnetic

Question 37

List three fluorescent lamp starting and operating methods

Answer 37

1. Instant Start 2. Rapid Start 3. Programmed rapid start

Question 38

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

Answer 38

Daylight harvesting

Question 39

The acronym DALI stands for....

Answer 39

Dynamic addressable lighting interface

Question 40

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.

Answer 40

Spectral power distribution curve (SPD)

Question 41

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

Answer 41

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

Question 42

``` Fluorescent lamps are about____%more efficent than incandescent lamps A.100% B.200% C.300% D.400% ```

Answer 42

D.400%

Question 43

``` 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 ```

Answer 43

C. Quality

Question 44

``` All white light sources can be evaluated by____and CRI. A. Color temperature B. Efficiency C. Quality D. Temperature ```

Answer 44

A. Color temperature

Question 45

``` Natural light is considered to have a CRI of____ A.25 B.50 C.75 D.100 ```

Answer 45

D.100

Question 46

Natural daylight maintains a constant color temperature True or False

Answer 46

False

Question 47

List 4 things that affect the color temperature of daylight?

Answer 47

1. Air pollution 2. Seasons 3 weather 4. Viewing angle

Question 48

``` 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 ```

Answer 48

B.2700k

Question 49

``` 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 ```

Answer 49

C.3500k to 4100k

Question 50

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

Answer 50

True

Question 51

____is the process by which lamps are operated at less than full light output. A. Dimming B. Efficacy C. Lumen maintenance D. Task lighting

Answer 51

A. Dimming

Question 52

``` 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 ```

Answer 52

A. Energy efficiency

Question 53

Incandescent lamps are more efficacious than fluorescent lamps. True or false

Answer 53

False

Question 54

``` If a ___cost analysis is completed, the efficacy of the lamps becomes very important. A efficacy B. Initial C. Life cycle D. Operating ```

Answer 54

C. Life cycle

Question 55

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

Answer 55

50