Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

WELL EXAM > Light Concept > Flashcards

Light Concept Flashcards

1
Q

Range of all types of electromagnetic radiation

A

Electromagnetic spectrum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Energy in the form of waves, including gamma rays, x rays, UV, visible light, IR, microwave, and radio waves

Classified by wavelengths using nanometers

A

Electromagnetic radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Distance between two points on a wave in which the wave repeats itself

A

Wavelengths

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Wavelengths range from

A

400 nanometer to 700 nm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Can cause skin and eye damage

A

UV light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Can cause air or objects to heat up, raise building temp

A

Infrared

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Great source of illumination with positive effect on health

• too much can cause glare and affect visual acuity

A

Natural light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Converts electrical energy into light

A

Lamp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

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

A

Luminaire

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

4 types of lamps

A

Incandescent
Fluorescent
High intensity discharge (HID) lamps
LED light emitting diode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

lamp that produces light by flow of current through tungsten

Low cost, but low electrical efficiency and shorter life than other lamps

A

Incandescent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Low pressure discharge lamp where mercury vapor transforms UV light to visible light

Contains mixture of inert gas (argon and mercury vapor), provides UV light

A

Fluorescent Light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Produces light from an arc tube

A

High Intensity Discharge Lamps

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Light producing element of an HID light

A

Arc tube

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Contains metallic and gaseous vapors and electrodes

Includes in a bulb, may include phosphor that improves color rendering, increases light output, and reduces surface brightness

Types include low pressure sodium, mercury vapor, metal halide and high pressure sodium lamps

A

Arc tube

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Lamp with semi conductor devices that produce visible light when current passes through them

A

LED Lamp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Benefits of LED Lamp

A
  • Uses less energy and generate less heat
  • Some contains combination of red green and blue
  • This combination allows a fixture to be tunable, the color of light can be changed via external control
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

3 types of lighintg

A

Ambient lighting
Task lighting
Accent lighting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Known as general lighting, main source of nonspecific illumination of the space

Bright enough to allow safe movement

Should be integrated with daylight control system to maintain proper light levels in spaces

A

Ambient lighiting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Used to illuminate an area in order to allow the performance of a specific function

Often controlled by building occupants

  • Level of control may be mandated by building codes
  • Can reduce the glare on reflective surfaces, reducing eye strain and increasing productivity
A

Task Lighting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Decorative lighting, used to highlight architectural or design features of space

Generally small percentage of the lighting load but may be used to influence a positive effect on visual acuity and occupant health

A

Accent lighting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

color of light produced by light source

A

color temperature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

spectral distribution of EM radiation measured in Kelvin

A

correlated color temperature CCT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Lower the Kelvin, the xx the light?

A

warmer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Higher the Kelvin, the xx the light?

A

cooler

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Warm light - shade?

Cool light - shade?

A

Warmer light has yellow shade

Cooler light has blue shade

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Caused by fluctuation of voltage

Occurs more frequently with fluorescent lights with older ballasts

A

Flicker

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

Total luminous output of a light source

A

Luminous Flux

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

Measured in lumens and weighted to the visual sensitivity of the human eye

Total perceived amount of light being given off in all directions

A

Luminous Flux

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

Radiant power weighted to human vision that describes light emitted by source

Measured by candela

A

Luminous intensity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

Amount of light incident on a given surface

Measured in lux or foot candles

A

Illuminance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

One lumen per sqm

A

One lux

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

Equivalent to one lumen per sq ft

A

Foot candle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

One foot candle is how many lux?

A

One foot candle is approximately 10.8 lux

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

Measurement of how bright a surface or light source will appear to the eyes

Measured in candela per sqm cd/m2 or footlambers

A

Luminance

36
Q

Internal clock that keeps body’s hormones and bodily processes on a roughly 24hr cycle, even in continuous darkness.

Can influence sleep/wake, hormone release, body temp, and metabolism

A

Circadian Rhythm

37
Q

light that enters eye is picked up by three photoreceptive cells who absorb light and transmit info and signals. To brain

A

Photoreceptive cells

38
Q

Facilitate vision, peripheral vision and vision in dim places, but offer low visual acuity and color perception

Sensitive to green blue light 498nm

A

Rodes

39
Q
  • Facilitate synchronization of circadian rhythms
  • Peak sensitivity to teal blue light 480nm
  • Contain melanopsin - photopigment that aids in maintaining circadian rhythms
  • Exposure to 480nm light later in the dat can alter and cause disruption in biological cycles
A

Intrinsically Photosensitive retinal ganglion cells (ipRGCs)

40
Q

Align physiological functions to 24hr solar day and influence

A

Zeitgebers

41
Q

Difference between visual lux and amount of light that will affect circadian rhythms

Measure of light that is used to quanify how much a light source will stimulate light response of melanopsin

A

equivalent melanopic lux EML

42
Q

clarity or sharpness of vision

A

Visual acuity

43
Q

Feature 53: Visual Lighting Design precondition for?

A

NEI and NEB

44
Q

Feature 53: Visual Lighting Design requires what?

A

Task lighting must be available upon request if ambient light not enough

Narrative for brightness is also required

45
Q

Feature 53: Visual Lighting Design. Part 1: Visual Acuity for Focus includes

  • requirement for ambient light?
  • controlled lighting?
  • intensity of task lighting?
A

Part 1a - ambient lighting of 215 lux (20 fc) be maintained as measured on horizontal work place

May be dimmed if daylight supplements the lighting, but electrical lighting must be able to achieve this level in the absence of light source

Part 1b - specifies the size of independently controlled lighting zones for ambient lighting system

Max size that meets the requirements of 46.5 sqm or 20% of open floor space, whichever is larger

Part 1c - If ave ambient light is below 300 lux (28 fc) then task lighting must be used to provide 300 lux to 500 lux (28 fc to 46 fc) at work surfaces

46
Q

Feature 53: Visual Lighting Design. Part 2 requires what?

at least ___ of 4?

for corridors and stairwells?
for task surfaces and adjacent surfaces?
for task surfaces and remote rooms?
for ceilings?

A

Require narrative. At least 2 of 4.

Main room cannot exhibit 10x greater or lesser luminance than an ancillary space.

Surface cannot exhibit 3x greater or lesser luminance than adjacent surface

Cannot exhibit 10x greater or lesser luminance than a remote surface in the same room

One part of a ceiling cannot exhibit 10x greater or lesser luminance than another part of the ceiling in the same room

47
Q

Feature 54: Circadian Lighting Design precondition for ?

A

NEI and NEB

48
Q

Light levels that affect a person’s physiology by influencing circadian rhythms

Measured on the vertical plane at the average eye level of the building occupants

A

EML Equivalent Melanopic Lux

49
Q

Feature 54: Circadian Lighting Design. Part 1: Melanopic Light Intensity for Work Areas requires what?

requires \_\_\_ of 2 options
\_\_\_ EML for \_\_\_\_ of workstations 
Measured on \_\_\_\_\_ plane facing forward
at \_\_\_\_\_ meters above finishes floor
at what time?

Maintained illuminance on the ____ of ____ EML or greater

A

Requires light models or light calculations demonstrating that one of two options is met

200EML is present at 75% or more of workstations,

Measured on vertical plane facing forward, 1.2m or 4inches above finished floor

From 9-1pm

Part 1b - requires that electrical lights for all workstations provided a maintained illuminance on the vertical plane facing forward of 150 EML or greater

50
Q

excessive brightness, contracts and quantity of light

A

Glare

51
Q 
Feature 55: Electric Light Glare Control. Part 1: Luminaire Shielding. Requires shielding angles 
Less than 20K cd/m2?
20K to 50K?
50K to 500K?
500K and above?
A

Requires that minimum shielding angles be observed in regularly occupied spaces depending on the ff:

no shielding required
20K to 50K - shielding of 15 deg
50-500K - shielding angle of 20 deg
500 and above - shielding angle of 30 deg

52
Q

Feature 55: Electric Light Glare Control. Part 2: Glare Minimization applies to?

Requires any light source more than ____ degree must have luminance values of less than _____ cs/m2

Requires workstations to achieve UGF of _____

A

Applies to all workstations

Part 2a requires any light source more than 53 deg must have luminance values of less than 8000cs/m2

Part 2b requires workstations to achieve unified glare rating of 19 or less

53
Q

rating helps indicate degree of discomfort caused by glare from luminaires and bright light sources

Ranges from 5 to 30,the lower the number the less glare

A

UGR unified glare rating

54
Q

Feature 56: Solar Glare Control optimization for?

A

Core and Shell

55
Q

Glazing required for View windows below 2.1m:

A

Requires at least 1 of 3 be implemented for glazing less than 2.1
 Part 1a - option of interior window shading or blings that are manual or automatic
 Part 1b - option of exterior sharing systems to prevent glare
 Part 1c - option of variable opacity glazing that reduces transmissivity by 90% or more

56
Q

Smart glass that has ability to control amount of light passing through it

A

Variable opacity glazing

57
Q

Daylight management for greater than 2.1m - requires at least ____ of 5.

A

1 of 5.

Shading options that have manual or automatic controls eg:

  • Interior window shading or blinds
  • External shading
  • Interior light shelves
  • Micromirrors on the windows that reflect light toward ceiling
  • Variable opacity glazing
58
Q

Feature 57: Low glare workstation design optimization for?

A

NEI and NEB

59
Q

Feature 57: Low glare workstation design. Part 1: Glare Avoidance - has 2 requirements that must be met which are?

A

Part 1 a-requires all screen at desk located within 4.5M 15 inches of view windows must be able to be oriented within 20 deg angle perpendicular to the plane

Part 1b - requires overhead luminaires not be aimed directly at computer screens

60
Q

Feature 58: Color Quality optimization for?

A

NEI and NEB

61
Q

Color quality is measured using what?

A

CRI

62
Q

Index that features a comparison of appearance of 8 to 14 colors under light source in comparison o a blackbody source of the same color

o Measured using palate of reference R1 to r14

o CRI RA - value of 1 to 100 based on R1 through r8

A

CRI

63
Q

Color Rendering Index applies to?

A

Applies to all electric lights, except for decorative, emergency, or special purpose lighting

64
Q

Feature 58: Color Quality requires CRI to be?

CRI R1 to R8 be
CRI R9 be

A

Part 1a - CRI Ra be 80 or higher

Part 1b - requires CRI Ra be 50 or higher. R9 represents red tones and allows a more accurate representation of actual color

65
Q

Feature 59: Surface Design optimization for?

A

NEI and NEB

66
Q

2 forms of lighting

A

Direct and reflected light

67
Q

Comes from luminaires and incoming sunlight

A

Direct light

68
Q

Direct light reflected in ceilings, walls

A

Reflected light

69
Q

Rating of how much usable light is reflected, with values ranging from o to 1
o 0 means black
o 1 means white

A

LRV

70
Q

Feature 59: Surface Design. Part 1: Working and Learning Area Surface Reflectivity requires what
for ceilings?
for vertical surfaces?
for furniture systems

A

Requires 3 sets of surfaces meet minimum LRVs

Ceilings - 0.8 or 80% of surface area

Vertical surfaces - 0.7 or 50% of surface area

Furniture systems - 0.5 or 50% of surface area

71
Q

Feature 60: Automated Shading and Dimming Controls optimization for?

A

NEI and NEB

72
Q

Feature 60: Automated Shading and Dimming Controls. Part 1: Automated Sunlight Control - applies to windows
size?
requires sensors that does 2 things. cite these.

A

Larger than 0.55m2 6ft2

Requires that windows have automatic shading device for reducing glare at workstations and other seating areas.

A sensor controlled sunlight control system that automatically raises and lowers shades

Can be integrated into building systems

73
Q

Feature 60: Automated Shading and Dimming Controls. Part 2 Responsive Light Control requires what?

A

o Part 2a: requires lighting to automatically dim to 20% or less or shut off when zone is unoccupied

o Part 2b: requires fixtures in the space be programmed to dim continuously as daylight levels increase

74
Q

Feature 61: Right to Light. Part 1: Lease Depth - requires what?

A

Requires that 75% of area be within 7.5m or 25 inches of view windows.

Near perimeter of building

75
Q

Feature 61: Right to Light. Part 2: Window Access requires what?

A

Requires workstations be given distance of an atrium or allow views of the exterior

Allows natural daylight

Part 2a: requires 75% of workstations be within 7.5m or 25i of a view window or atrium

Part 2b: expands this to 95% but moves the threshold back to 12.5m

76
Q

Feature 62: Daylight Modeling optimization for?

A

3 project types

77
Q

Feature 62: Daylight Modeling involves what?

A

Process of using a computer program to stimulate effects of natural light on the interior

Allows teams to achieve appropriate lighting

Minimum levels of natural lighting in a space are defined with spatial daylight autonomy sDA and the maximum levels of sunlight are defined annual sunlight exposure

78
Q

% of floor space in which min light level can be met during operating hours

A

Saptial daylight autonomy sDA

79
Q

Feature 62: Daylight Modeling requirements

A

sDA - 300, 50% minimum level 300 lux (28fc) for the area for 50% of the analysis period.

Ade 1000,250 space received 1000 lux 93fc for at least 250 hours per year

if ASE value is over, then glare and thermal discomfort is apparent

80
Q

Feature 62: Daylight Modeling. Part 1: Healthy Sunlight Exposure - has 2 requirements. Cite these.

A

Part 1a - Sda 300,50% for 55% of spaces

Part 1b - ASA 1000250 for no more than 10% of space

81
Q

Feature 63: Daylighting Fenestration optimization for?

A

3 project types

82
Q

Feature 63: Daylighting Fenestration. Part 1: Window Size for Working and Learning Spaces

Two conditions for facades

A

Part 1a - window wall ratio on external elevations be between 20-60%

ratio is > 40%, strategies, internal and external shading must be in place

Part 1b - requires that 40-60% of window area be at least 2.1m 7’ off the floor, which means it must a daylight window

83
Q

Glazing designed to hide construction features.

Not included in this calculation

A

Spandrel

84
Q

Feature 63: Daylighting Fenestration. Part 2: Window Transmittance in Working and Learning Areas - requires what?

A

Part 2a - requires non decorative glazing, excluding skylights, located above 2.m 7i have a VT of 60%
- Allows increased daylight

Part 2b - requires non decorative glazing located below 2.1m have VT of 50% or more
-Lower value reduces amount of glare

85
Q

Feature 63: Daylighting Fenestration. Part 3: Uniform Color Transmittance - requires what?

A

Requires VT of wavelengths between 400nm and 650 nm not vary by more than a factor of 2 for daylight glazing

Highest VT for any wavelength between 400nm and 650 nm cannot be more than 2 x the lowest VT for any wavelength bet 400 nm and 650nm

WELL EXAM (9 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions