Chapter 4

Question 1

___ the earliest known unit of illumination still used today.

Answer 1

Foot-candle

Question 2

_____First developed a working incandescent light bulb using carbon-fillament lamp in _____

Answer 2

Joseph Swan, February 5, 1879

Question 3

On _____, the niagra falls power company became the 1st commercial utility to produce and transmit hydroelectric power.

Answer 3

August 26, 1895

Question 4

Developed technical standards, specifications and design techniques to govern the design and construction of building lighting and electrical systems.

Answer 4

Professional Organization

Question 5

The ____ of a human is composed of the eye, optic, nerve, and certain parts of the brain

Answer 5

Visual System

Question 6

The ____ is that part of the visual system where the impulses are processed.

Answer 6

Brain

Question 7

The eye functions much like a simple, very crude camera. race of light pass through the transparent cornea of the eye and through an opening called the ____.

Answer 7

Pupil

Question 8

Light is a form of energy known as _____.

Answer 8

Electromagnetic Radiation

Question 9

____ number of wave cycles per second.

Answer 9

Frequency

Question 10

_____ is the amount of light incident on (striking) a surface.

Answer 10

Illuminance

Question 11

A ___ is a device that generates light.

Answer 11

lamp

Question 12

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

Answer 12

Luminous flux

Question 13

____ is the SI unit of luminous intensity.

Answer 13

Candela (cd)

Question 14

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

Answer 14

Luminous Efficacy

Question 15

The _____ is a method of numerically comparing the color distribution of a light source to your reference lamp.

Answer 15

Color Rendering Index (CRI)

Question 16

____ are filament-light coils at the end(s) off the bulb that act as terminal for the electric circuit.

Answer 16

Cathodes

Question 17

______ sometimes called “general lighting”, provides uniform illumination or throughout the space

Answer 17

Ambient Lighting

Question 18

sometimes called “task lighting”. illumination provided for a specific visual function.

Answer 18

local lighting

Question 19

____ is directional lighting used to emphasize a particular object or area.

Answer 19

accent lighting

Question 20

_____ is light source that adds a quality of interest to the space.

Answer 20

decorative lighting

Question 21

____ ensures the safety of people involved in a potentially hazardous process.

Answer 21

safety lighting

Question 22

A luminaire that is hang with a cord, chain, or tube that enables it to be suspended from a ceiling or other support.

Answer 22

pendent

Question 23

Recessed Luminaires are mounted above the ceiling or behind the wall or other surface so that any visible projection of light is ___.

Answer 23

Insignificant

Question 24

____ is a luminaire that is designed to emit an intense, concentrated beam of light with usually no more than a 20° divergence (spread) from where it is directed.

Answer 24

Spotlight

Question 25

____ is a lighting component such as a translucent glass refractor that redirects or scatters the light from a source.

Answer 25

Diffuser

Question 26

____ a lighting installation where the light source is shielded by a panel that is parallel to the wall at the top of a window.

Answer 26

Valance Lighting

Question 27

______ of the light is directed downward with a remainder directed upward.

Answer 27

Semidirect 60 to 90%

Question 28

_____ is everything of a lighting installation expressed as a percentage of individuals who, when viewing from a specified location and in a specified direction, will be expected to find it acceptable in terms of discomfort glare.

Answer 28

Visual Comfort Probability (VCP)

Question 29

____ is the amount of light incident on (striking) a surface

Answer 29

Illuminance

Question 30

____ unit of measure of illuminance.

Answer 30

Foot-candle

Question 31

The SI unit for illuminance.

Answer 31

Lux

Question 32

it states that the illuminance at a point on a plane perpendicular to the line joining the joint and the source is inversely proportional to the square of the distance between the source and the plane.

Answer 32

inverse square law

Question 33

The ___ is the currently accepted method for calculating average illuminance levels for indoor areas unless the light distribution is extremely asymmetric.

Answer 33

Zonal Cavity Method

Question 34

The space between the work plane and the floor is called the ____.

Answer 34

floor cavity

Question 35

The ____ ratio is an approximate maximum spacing-to-mounting height racial required to ensure uniform illumination on the work plane.

Answer 35

Spacing Criterion (CS)

Question 36

A ___ can control the lighting installation from _____.

Answer 36

Switch, one or multiple

Question 37

sense light and can be used to control night lighting and lieu of a time clock or timer.

Answer 37

photocell controls

Question 38

An ___ is an interior courtyard covered with glazing

Answer 38

atrium

Question 39

____ is a transparent panel located in a roof opening that allows direct and diffuse sunlight into the building.

Answer 39

skylights

Question 40

______ is a passive (non-mechanical) architectural element or mechanism that allow sunlight to enter deep into a building

Answer 40

reflective light shelves

Question 41

_________ and _______ woven fiberglass are commercially available fabric roof membranes that have been used successful.

Answer 41

polyvinyl chloride-polyester and Teflon-coated