Light

Question 1

The wavelengths of visible light range from roughly 400 nm to ___ nm.

Answer 1

700

Question 2

The ___ of the eye mostly facilitate circadian rhythm synchronization and demonstrate peak sensitivity to teal-blue light (about 480 nm).

Answer 2

ipRGCs

Question 3

___ lighting is lighting that is used to illuminate an area in order to allow the performance of a specific function.

Answer 3

Task

Question 4

___, is a precondition for the New and Existing Interiors and New and Existing Buildings project types that establish light levels for basic visual performance.

Answer 4

Feature 53: Visual Lighting Design

Question 5

The circadian rhythm is the internal clock that keeps the body’s hormones and bodily processes on a roughly ___ cycle, even in continuous darkness.

Answer 5

24 hour

Question 6

___ is the excessive brightness, excessive brightness contrast, and excessive quantity of light of a light source.

Answer 6

Glare

Question 7

___ glazing is glazing that is below 2.1 m (7’) and designed to allow building occupants clear views of the outside.

Answer 7

Vision

Question 8

The color rendering index average (CRI Ra) is a value on a scale of 1 to ___ based on reference colors R1 through R8.

Answer 8

100

Question 9

Part 2: Responsive Light Control of Feature 60 requires that lighting automatically dim to ___% or less, or shut off, when a zone is unoccupied.

Answer 9

20

Question 10

The goal of ___ is to optimize a project’s windows in order to increase the amount of daylight available for the building spaces while limiting the amount of glare and heat gain.

Answer 10

Feature 63: Daylighting Fenestration

Question 11

A complete lighting unit that includes the components that distribute light, position and protect the lamps, and provide connection to the power supply.

Answer 11

Luminaire

Question 12

Glazing that is specifically designed and located to allow for deeper penetration of daylight into the interior spaces of a building.

Answer 12

Daylight glazing

Question 13

The amount of light in the visible portion of the spectrum (roughly 400 nm to 700 nm) that passes through a glazing material. VT is measured as a percentage or number from 0 to 1.

Answer 13

Visible transmittance (VT)

Question 14

The range of all types of electromagnetic radiation.

Answer 14

Electromagnetic spectrum

Question 15

Radiant power weighted to human vision that describes light emitted by a source in a particular direction.

Answer 15

Luminous intensity

Question 16

The total luminous output of a light source, measured in lumens and weighted to the visual sensitivity of the human eye.

Answer 16

Luminous flux

Question 17

Energy in the form of electromagnetic waves, including gamma rays, X-rays, ultraviolet (UV) light, visible light, infrared (IR) light, microwave radiation, and radio waves.

Answer 17

Electromagnetic radiation

Question 18

The distance between two points on a wave in which the wave repeats itself.

Answer 18

Wavelength

Question 19

The amount of light incident on a given surface measured in lux or footcandles.

Answer 19

Illuminance

Question 20

The spectral distribution of electromagnetic radiation of a blackbody at a given temperature, measured in degrees Kelvin (K).

Answer 20

Correlated color temperature (CCT)

Question 21

An output component that converts electrical energy into light.

Answer 21

Lamp

Question 22

Lighting that is used to highlight architectural or design features of a space or to add visual interest to a space. Also known as decorative lighting.

Answer 22

Accent lighting

Question 23

A lamp that produces light from an arc tube.

Answer 23

High-intensity discharge (HID) lamp

Question 24

A rating of how much usable light is reflected or absorbed by a given surface, with values ranging from 0 (0%) to 1 (100%).

Answer 24

Light reflectance value (LRV)

Question 25

A percentage of space in which the light level from direct sun alone exceeds a predefined threshold for some quantity of hours in a year.

Answer 25

Annual sunlight exposure (ASE)

Question 26

A lamp with semiconductor devices that produce visible light when an electrical current passes through them.

Answer 26

Light-emitting diode (LED) lamp

Question 27

The clarity or sharpness of vision.

Answer 27

Visual acuity

Question 28

A measure of light that is used to quantify how much a light source will stimulate the light response of melanopsin.

Answer 28

Equivalent melanopic lux (EML)

Question 29

A percentage of floor space in which a minimum light level can be met completely for some proportion of regular operating hours by natural light.

Answer 29

Spatial daylight autonomy (sDA)

Question 30

A lamp that produces light by the flow of current through a tungsten filament inside a sealed glass bulb sometimes filled with a gas.

Answer 30

Incandescent lamp

Question 31

The main source of nonspecific illumination in a space. Also known as general lighting.

Answer 31

Ambient lighting

Question 32

A measurement of how bright a surface or light source will appear to the eye, measured in candela per square meter (cd/m2) or footlamberts.

Answer 32

Luminance

Question 33

An index that features a comparison of the appearance of 8 to 14 colors under a light source in comparison to a blackbody source of the same color temperature

Answer 33

Color rendering index (CRI)

Question 34

A low-pressure discharge lamp in which ionization of mercury vapor transforms UV light generated by the discharge into visible light.

Answer 34

Fluorescent lamp

Question 35

The internal clock that keeps the body’s hormones and bodily processes on a roughly 24-hour cycle, even in continuous darkness

Answer 35

Circadian rhythm

Question 36

The process of using a computer program to simulate the effects of natural light on the interior of a new or existing building.

Answer 36

Daylight modeling

Question 37

Glazing that has the ability to control the amount of light passing through it. Also known as smart glass.

Answer 37

Variable opacity glazing