Light

Question 1

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

Answer 1

700nm

Question 2

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

Answer 2

ipRGC’s

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 establishes 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

View Window

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

How many features does Light have?

Answer 11

11

Question 12

Light Key Facts + Biology of the eyes:

Rods facilitate peripheral vision and vision in ___ lighting conditions with peak sensitivity to ___ light

Answer 12

Rods facilitate peripheral vision and vision in dim lighting conditions with peak sensitivity to green-blue light

Question 13

Light Key Facts + Biology of the eyes:

Cones facilitate ___ vision and color perception and have peak sensitivity to ___ light

Answer 13

Cones facilitate daytime vision and color perception and have peak sensitivity to green-yellow light

Question 14

Light Key Facts + Biology of the eyes:

ipRGC’s are critical to the ___ and demonstrate pear sensitivity to ___ light

Answer 14

ipRGC’s are critical to the circadian and demonstrate pear sensitivity to teal-blue light

Question 15

Light Key Facts + Biology of the eyes:
Suprachiasmatic nucleus is the location of the main ___ circadian clock that acts as an oscillator to synchronize clocks in peripheral tissues and organs

Answer 15

Suprachiasmatic nucleus is the location of the main mammalian 24-hour circadian clock

Question 16

Zeitgebers are ___ cues that align physiological functions to the solar cycle. Light is the most important zeitgeber, keeping the body’s interal clocks synchronized in a process known as ___.

Answer 16

Zeitgebers are external cues that align physiological functions to the solar cycle. Light is the most important zeitgeber, keeping the body’s interal clocks synchronized in a process known as circadian photoentraintment.

Question 17

The ___ sensitivity for the sensation of brightness occurs at ___ light.

Answer 17

peak sensitivity, green-yellow light

Question 18

___ light is at smaller wave lengths while ___ is at larger wave lengths.

Answer 18

Ultraviolet, infrared

Question 19

Chronic ___ is associated with diabetes, obesity, depression, heart attach, hypertension and stroke. The institute of medicine reports that about ___ US adults have chronic sleep or wakefulness disorder

Answer 19

chronic sleep deprivation, 50-70 million

Question 20

Feature 53: Visual Lighting Design, Part 1: Visual Acuity for focus, requires the following are met at workstations or desks:

a. The ambient lighting system can maintain an average light ___ of ___ lux or more, measured on the ___ plane, 0.76 m [30 inches] above finished floor. The lights may be dimmed in the presence of daylight, but they are able to independently achieve these levels.
b. The ambient lighting system is zoned in independently controlled banks no larger than ___SF or ___% of ___ of the room (whichever is larger).
c. If ambient light is below ___lux, ___ lights providing ___-___ lux at the work surface are available upon request.

Answer 20

a. The ambient lighting system can maintain an average light intensity of 215 lux or more, measured on the horizontal plane, 0.76 m [30 inches] above finished floor. The lights may be dimmed in the presence of daylight, but they are able to independently achieve these levels.
b. The ambient lighting system is zoned in independently controlled banks no larger than 500 SF or 20% of open floor area of the room (whichever is larger).
c. If ambient light is below 300 lux task lights providing 300 to 500 lux at the work surface are available upon request.

Question 21

Feature 53: Visual Lighting Design, Part 1: Visual Acuity for focus, requires the following are met at workstations or desks:

a. The ambient lighting system can maintain an average light ___ of ___ lux or more, measured on the ___ plane, 0.76 m [30 inches] above finished floor. The lights may be dimmed in the presence of daylight, but they are able to independently achieve these levels.
b. The ambient lighting system is zoned in independently controlled banks no larger than ___SF or ___% of ___ of the room (whichever is larger).
c. If ambient light is below ___lux, ___ lights providing ___-___ lux at the work surface are available upon request.

Answer 21

a. The ambient lighting system can maintain an average light intensity of 215 lux or more, measured on the horizontal plane, 0.76 m [30 inches] above finished floor. The lights may be dimmed in the presence of daylight, but they are able to independently achieve these levels.
b. The ambient lighting system is zoned in independently controlled banks no larger than 500 SF or 20% of open floor area of the room (whichever is larger).
c. If ambient light is below 300 lux task lights providing 300 to 500 lux at the work surface are available upon request.

Question 22

Light Key Fact:

Ambient lighting of ___ lux are sufficient for most tasks.

Answer 22

300 lux

Question 23

Feature 53: Visual Lighting Design, Part 2: Brightness Management Strategies, requires that the project provide a ___ that describes strategies for maintaining ___ in spaces, which takes into consideration at least two of the following:

a. ___ between main rooms and ancillary spaces, such as corridors and stairwells, if present.
b. ___ between task surfaces and immediately adjacent surfaces, including adjacent visual display terminal screens.
c. ___ between task surfaces and remote, non-adjacent surfaces in the same room.
d. The way brightness is distributed across ceilings in a given room.

Answer 23

requires that the project provide a narrative that describes strategies for maintaining luminance balance in spaces, which takes into consideration at least two of the following:

a. Brightness contrast between main rooms and ancillary spaces, such as corridors and stairwells, if present.
b. Brightness contrast between task surfaces and immediately adjacent surfaces, including adjacent visual display terminal screens.
c. Brightness contrast between task surfaces and remote, non-adjacent surfaces in the same room.
d. The way brightness is distributed across ceilings in a given room.

Question 24

Feature 54: Circadian Lighting Design, Part 1: Melanopic Light Intensity for Work Areas, requires that at least ___ of the following (2) requirements are met:

a. Light models or light calculations (which may incorporate daylight) show that at least ___equivalent melanopic lux (EML) is present at ___% or more of workstations, measured on the ___ plane facing forward, 4 ft above finished floor. This light level is present for at least the hours between ___am and ___pm for ___ days of the year.
b. For all workstations, electric lights (which may include task lighting) provide maintained illuminance on the vertical plane facing forward of ___ equivalent melanopic lux (EML) or greater.

Answer 24

At least one of the following 2 are met:

a. Light models or light calculations (which may incorporate daylight) show that at least 200 equivalent melanopic lux is present at 75% or more of workstations, measured on the vertical plane facing forward, 4 ft above finished floor. This light level is present for at least the hours between 9:00 am and 1:00 pm for every day of the year.
b. For all workstations, electric lights (which may include task lighting) provide maintained illuminance on the vertical plane facing forward of 150 equivalent melanopic lux or greater.

Question 25

Feature 55: Electric Light Glare, Part 1: Lamp Sheilding, requires the following shielding angles (⍺ = 90 - cutoff angle) must be observed for lamps in regularly occupied spaces with luminance values in the ranges specified:

a. ___ shielding required for less than 20,000 cd/m² (including reflected sources).
b. ___ sheilding required for 20,000 to 50,000 cd/m².
c. ___ for 50,000 to 500,000 cd/m².
d. ___ for 500,000 cd/m² and above.

Answer 25

a. No shielding required for less than 20,000 cd/m² (including reflected sources).
b. ⍺: 15° for 20,000 to 50,000 cd/m².
c. ⍺: 20° for 50,000 to 500,000 cd/m².
d. ⍺: 30° for 500,000 cd/m² and above.

Question 26

Feature 55: Electric Light Glare, Part 2: Glare Minimization, requires one of the following requirements is met at workstations and desks:

a. Luminaires more than ___ degrees above the center of view (degrees above horizontal) have luminances less than ___ cd/m².
b. Workstations, desks and other seating areas achieve a UGR of 19 (or less).

Answer 26

a. Luminaires more than 53° above the center of view (degrees above horizontal) have luminances less than 8,000 cd/m².
b. Workstations, desks and other seating areas achieve a UGR of 19 (or less).

Question 27

Feature 56: Solar Glare Control, Part 1: View Window Shading, requires that at lease ___ of the following 3 are present for all glazing less than ___FT AFF:

a. ___ window ___ or ___ that are controllable by the occupants or set on a timer.
b. ___ shading systems that are controllable by the occupants or set on a timer.
c. ___, such as electrochromic glass, which can reduce transmissivity by 90% or more.

Answer 27

At least 1 is met for glazing less than 7ft AFF:

a. Interior window shading or blinds that are controllable by the occupants or set on a timer.
b. External shading systems that are controllable by the occupants or set on a timer.
c. Variable opacity glazing, such as electrochromic glass, which can reduce transmissivity by 90% or more.

Question 28

Feature 56: Solar Glare Control, Part 2: Daylight Management, requires at least ___ of the following is present for all glazing greater than ___FT AFF:

a. Interior window shading or blinds that are controllable by the occupants or set on a timer.
b. External shading systems that are controllable by the occupants or set on a timer.
c. ___ to reflect sunlight toward the ceiling.
d. A film of ___ on the window that reflects sunlight toward the ceiling.
e. Variable opacity glazing, such as electrochromic glass, which can reduce transmissivity by 90% or more.

Answer 28

Requires at least 1 of the following is present for all glazing greater than 7FT AFF:

a. Interior window shading or blinds that are controllable by the occupants or set on a timer.
b. External shading systems that are controllable by the occupants or set on a timer.
c. Interior light shelves to reflect sunlight toward the ceiling.
d. A film of micro-mirrors on the window that reflects sunlight toward the ceiling.
e. Variable opacity glazing, such as electrochromic glass, which can reduce transmissivity by 90% or more.

Question 29

Feature 57: Low-glare Workstation Design, Part 1: Glare Avoidance, requires the following (2) are met:

a. To minimize glare caused by incoming sunlight, all computer screens at desks located within ___ft of view windows should be oriented within a ___° angle ___ to the plane of the nearest window.
b. Overhead luminaires are not aimed directly at computer screens

Answer 29

a. To minimize glare caused by incoming sunlight, all computer screens at desks located within 15ft of view windows should be oriented within a 20° angle perpendicular to the plane of the nearest window.
b. Overhead luminaires are not aimed directly at computer screens

Question 30

Feature 58: Color Quality, Part 1: Color Rendering Index, requires that [number] of ___ lights meet the following (2):

a. Color Rendering Index ___ (Ra) is ___ or higher.
b. Color Rendering Index ___ of ___ or higher.

Answer 30

Requires that ALL of electric lights meet the following (2):

a. Color Rendering Index Average (Ra) is 80 or higher.
b. Color Rendering Index R9 of 50 or higher.

Question 31

59: Surface Design, Part 1: Working and Learning Area Surface Reflectivity, requires the following light reflectance values (LRV) are met:
a. Ceilings have an average LRV of ___/___% or more for at least ___% of surface are in regularly occupied spaces
b. Walls have an average LRV of ___/___% or more for at least ___% of surface area directly visible from regularly occupied spaces
c. Furniture systems have an average LRV of ___/___% or more for ___% of surface area directly visible from regularly occupied spaces

Answer 31

a. Ceilings have an average LRV of 0.8 (80%) or more for at least 80% of surface are in regularly occupied spaces
b. Walls have an average LRV of 0.7 (70%) or more for at least 50% of surface area directly visible from regularly occupied spaces
c. Furniture systems have an average LRV of 0.5 (50%) or more for 50% of surface area directly visible from regularly occupied spaces

Question 32

Feature 60: Automated Shading and Dimming Controls, Part 1: Automated Sunlight Control, requires that all windows larger than ___SF have the following:

a. ___ devices that ___ engage when light sensors indicate that sunlight could contribute to glare at workstations

Answer 32

requires that all windows larger than 6SF have the following:

a. Shading devices that automatically engage when light sensors indicate that sunlight could contribute to glare at workstations

Question 33

Feature 60: Automated Shading and Dimming Controls, Part 2: Responsive Light Control, requires the following are met in all major areas [2 items]:

a. All lighting except decorative fixtures is programmed using occupancy sensors to automatically dim to ___% or less (or switch off) when the zone is unoccupied.
a. All lighting except decorative fixtures has the capacity and is programmed to dim ___ in response to ___

Answer 33

a. All lighting except decorative fixtures is programmed using occupancy sensors to automatically dim to 20% or less (or switch off) when the zone is unoccupied.
a. All lighting except decorative fixtures has the capacity and is programmed to dim continuously in response to daylight

Question 34

61 Right to Light, Part 1: Lease Depth, requires the following (1 item) is met

a. ___% of the area of all ___ spaces is within ___ft of view windows

Answer 34

a. 75% of the area of all regularly occupied spaces is within 25 ft of view windows

Question 35

61 Right to Light, Part 2: Windows Access, requires the following (2) conditions are met:

a. ___% of all desks or ___ seats are within ___ft of an atrium or a window with views to the exterior
a. ___% of all desks or ___ seats are within ___ft of an atrium or a window with views to the exterior

Answer 35

a. 75% of all desks or regularly occupied seats are within 25 ft of an atrium or a window with views to the exterior
a. 95% of all desks or regularly occupied seats are within 41 ft of an atrium or a window with views to the exterior

Question 36

62: Daylight Modeling, Part 1: Healthy Sunlight Exposure

Requires that lighting ___ demonstrate that the following (2) conditions are expected:

a. Spatial ___ autonomy is achieved for at least 55% of regularly occupied space. In other words, at least ___% of the space receives at least ___ lux of sunlight for at least ___% of operating hours each year.
b. Annual ___ exposure is achieved for no more than 10% of regularly occupied space. In other words, no more than ___% of the area can receive more than ___ lux for ___ hours each year.

Answer 36

Requires that lighting simulations demonstrate that the following (2) conditions are expected:

a. Spatial daylight autonomy is achieved for at least 55% of regularly occupied space. In other words, at least 55% of the space receives at least 300 lux of sunlight for at least 50% of operating hours each year.
b. Annual sunlight exposure is achieved for no more than 10% of regularly occupied space. In other words, no more than 10% of the area can receive more than 1,000 lux for 250 hours each year.

Question 37

63: Daylight Fenestration, Part 1: Window Sizes for Working and Learning Spaces, requires that the following (2) conditions are met:

a. ___ ratio as measured on external elevations is between ___% and ___%. Percentages greater than ___% require ___ shading or adjustable opacity glazing to control unwanted heat gain and glare.
b. Between ___% and ___% of window area is at least ___ft above the floor

Answer 37

a. Window-wall ratio as measured on external elevations is between 20% and 60%. Percentages greater than 40% require external shading or adjustable opacity glazing to control unwanted heat gain and glare.
b. Between 40% and 60% of window area is at least 7ft above the floor

Question 38

63: Daylight Fenestration, Part 2: Window Transmittance in Working and Learning Areas,
requires the following (2) ___ (VT) conditions are met for all non-decorative glazing:

a. All glazing located higher than ___ft from the floor has VT of ___% or more.
b. All glazing located ___ft or lower from the floor has VT of ___% or more.

Answer 38

requires the following (2) visible transmittance (VT) conditions are met for all non-decorative glazing:

a. All glazing located higher than 7 ft from the floor has VT of 60% or more.
b. All glazing located 7 ft or lower from the floor has VT of 50% or more.

Question 39

63: Daylight Fenestration, Part 3: Uniform Color Transmittance, requires all windows used for daylight meet the following (1) requirements:
a. The visible ___ of wavelengths between ___ and ___ nm does not vary by more than a factor of 2

Answer 39

a. The visible light transmittance of wavelengths between 400 and 650 nm does not vary by more than a factor of 2

Question 40

What percentage of the window area must be 2.1 m (7′) off the floor according to Part 1: Window Sizes for Working and Learning Spaces of Feature 63, Daylighting Fenestration?

1. 10-20%
2. 20-40%
3. 20-60%
4. 40-60%

Answer 40

40-60%

Question 41

A quiet space used for Part 2: Privacy of Feature 89, Adaptable Spaces, must meet what design and performance requirement?

Answer 41

Ambient lighting provides dimmable light levels at 2700K or less

Question 42

CRI is measured using a palate of reference colors called R___ through R___.

The color rendering index average (___) is a value on a scale from 1-___, based on R___ through R___.

Answer 42

CRI is measured using a palate of reference colors called R1 through R14.

The color rendering index average (CRI Ra) is a value on a scale from 1-100, based on R1 through R8.

(R8 = 100)

Question 43

What is the minimum window-to-wall ratio that requires external shading or adjustable-opacity glazing for Feature 63, Daylighting Fenestration?

Answer 43

40%

Question 44

What is the area of natural light that a project with 9300 m² (100,000 ft²) of occupied space must receive to meet the requirements of Feature 62, Daylight Modeling?

Answer 44

100,000 x .55 (55%) = 55,000

Question 45

What are the natural lighting lease depth requirements of all regularly occupied spaces for Feature 61, Right to Light?

1. 50% OF THE AREA IS WITHIN 25’ OF VIEW WINDOWS
2. 50% of the area is within 41’ of view windows
3. 75% of the area is within 25’ of atriums
4. 75% of the area is within 25’ of view windows

Answer 45

75% of the area is within 25’ of view windows

Question 46

What is the method of documentation or performance verification for Part 2: Glare Minimization of Feature 55, Electric Light Glare Control?

1. A letter of assurance from the architect
2. A letter of assurance from the contractor
3. An on-site spot check
4. An annotated operations schedule

Answer 46

1. A letter of assurance from the architect

Question 47

Feature 63, Daylighting Fenestration, limited the visible light transmittance of wavelengths between 400 nm and 650 nm to what factor for daylight windows?

Answer 47

2

Question 48

What is the minimum light reflectance value (LRV) for ceilings in regularly occupied spaces required by Feature 59, Surface Design?

a. LRV of 0.5 for at least 50% of surface area
b. LRV of 0.7 for at least 70% of surface area
c. LRV of 0.8 for at least 80% of surface area
d. LRV of 0.9 for at least 50% of surface area

Answer 48

c. LRV of 0.8 for at least 80% of surface area

Question 49

What is the external window-to-wall ratio that meets the requirements of Feature 63, Daylighting Fenestration?

a. 10% - 20%
b. 20% - 40%
c. 20% - 60%
d. 60% - 80%

Answer 49

c. 20% - 60%

Question 50

According to Feature 62, Daylight Modeling, what percentage of regularly occupied space is allowed to achieve the correct level of annual sunlight exposure ASE(1000,250)?

a. 10%
b. 25%
c. 55%
d. 75%

Answer 50

a. 10%

Question 51

If the window-to-wall ratio is 45% and the total window area measures 4000 ft2, what is the area of windows that must be more than 7′ off the floor for the first part of Feature 63, Daylighting Fenestration?

a. 400sq ft to 800 sq ft
b. 800 sq ft to 3000 sq ft
c. 1600 sq ft to 2400 sq ft
d. there is no minimum requirement because the ratio is less that 50%

Answer 51

c. 1600 sq ft to 2400 sq ft

[window-to-wall ratio = 45% and therefore meets window-to-wall requirement.

40-60% of windows required to be above 7FT (daylight windows)

4000SF x .4 = 1600
4000SF x .6 = 2400]