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WELL AP 7.11.2020 > Light Concept > Flashcards

Light Concept Flashcards

1
Q

How many adults have chronic sleep disorders?

A

50-70 million

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2
Q

what 6 health risks are sleep deprivation linked to?

A

diabetes

obesity

depression

heart attack

hypertension

stroke

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3
Q

Rods facilitate what type of vision?

A

peripheral

dim lighting

green-blue

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4
Q

Cones facilitate what type of vision?

A

daytime

color

green-yellow

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5
Q

What are ipRGCs and what type of vision?

A

Intrinsically Photosensitive Retinal Ganglion Cells

see light over long-term

used in circadian system

teal blue

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6
Q

What are external cues called, including light, that align physiology to solar day?

A

Zeitgebers

circadian photo entrainment

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7
Q

Light exposure in the late night/early morning (4-6am) leads to ____.

A

phase advance - shifting our rhythms forward

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8
Q

Light exposure in the late afternoon/early night (4-6pm) shifts our rhythms ____.

A

backward - phase delay

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9
Q

53 - Visual Lighting Design Ambient light levels of ____ lux is sufficient, as measured at __ inches above the floor.

A

215 lux

30 inches

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10
Q

If light is below 300 lux, then task lights providing ___ to ___ lux need to be provided at work stations

A

300-500 lux

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11
Q

Ambient light system needs to be zoned in independently controlled banks no larger than ____ Sf or ___% of open floor area

A

500 SF or 20% of floor area

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12
Q

53 - Visual Lighting part 2, Brightness A narrative is provided that describes how 2 of 4 of the following will be considered:

A

brightness contrasts adjacent and non-adjacent spaces

brightness contrasts main rooms and ancillary spaces

brightness contrasts in the same room such as desk surface and computer screen

how brightness is distributed on the ceiling

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13
Q

54 - Circadian Lighting Design What is EML and what is the desired level? ___ EML at ___% of workstations measured ___ft above floor for ___hrs/day all year

A

Equivalent Mealnopic Lux - a measurement of biological effect of light on humans 250 EML at 75% stations, 4’ above floor, 4 hrs/day

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14
Q
  1. Electric Light Glare - lamp shielding reqs: (4 levesl)
A

a) under 20k = no shielding
b) 20k = 15 degrees
c) 50k = 20 degrees
d) 500k + = 30 degrees

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15
Q

What is the luminance limit for bare bulbs?

A

less than 8,000 cd/m2

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16
Q

56 - Solar Glare Control (windows) what are the two unique glazing options for windows higher than 7ft above floor?

A

interior light shelves

film of micro-mirrors both reflect light toward the ceiling

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17
Q

57 - Low-glare workstation design (screen angle) computer screens at desks located within ___ft of windows should be oriented ____ degrees perpendicular to winow plane

A

15 ft 20 degrees

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18
Q

58 - Color Quality (all electric light bulbs) To accurately oirtrat colors, all electric lights should meet the following (2):

A

R1-R8 is 80 Ra or higher

Color Rendering Index R9 of 50 or higher

19
Q

59 - Surface Design (reflective quality) what are the Light Relfectance Value (LRV) limits for: Ceilings, wall, furniture?

A

Ceilings - LRV 0.8 for 80% of surface

Walls - LRV 0.7 for 50%

Furniture - LRV 0.5 for 50%

20
Q

If you want to promote alertness and activity in a workspace, should you pick a surface with a high or low LRV?

A

Higher LRVs mean they reflect more light

21
Q

60 - Auto shading and dimming All windows larger than ___ have light sensor triggered shades

A

6 ft2

22
Q

60 - shading/dimming part 2 fixtures are auto dimmed to ___% or less when the zone is unoccupied, and will ____in response to daylight

A

20%

dim continuously

23
Q

61 - right to light (window/sunlight) ___% of ALL regularly occupied area is within ___ft of windows

A

75%,

25’

24
Q

61 - right to light, part 2, workstations ____% of workstations are within ____ft of an atrium/window (2 standards)

A

75% workstations within 25’ of window

95% within 41’

25
Q

62 - Daylight Modeling (correct exposure to sunlight) what describes the minimum levels?

A

Minimum - Spacial Daylight Autonomy - (sDA300, 55%) meaning 55% of space receives 300 lux 50% of operating hours annualy

26
Q

62 - Daylight Modeling (correct exposure to sunlight) and what describes the maximum levels?

A

Maximum - Annual Sunlight Exposure -

10% of space receives 1000 lux for 250 hours annualy

27
Q

63 - Daylight Fenestration - window sizes, glass opacity part 1 - proper window- wall ratio

A

20-60% (greater than 40% glass requires external shading)

28
Q

How much of window area should be at least 7’ from floor (daylight glass)?

A

40-60%

29
Q

All glazing located above 7’ should have a visible transmittance (VT) of ____% or more

A

60%

30
Q

All glazing located below 7’ should have a visible transmittance (VT) of ____% or more

A

50%

31
Q

63, part 3 - uniform color - colored glass window transmittance used for daylighting should not vary more than a factor of ___.

A

2

32
Q

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

A

700

33
Q

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

A

Luminous flux

34
Q

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

A

Illuminance

35
Q

A lamp that produces light from an arc tube.

A

High-intensity discharge (HID) lamp

36
Q

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

A

Light reflectance value (LRV)

37
Q

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

A

Light-emitting diode (LED) lamp

38
Q

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

A

Equivalent melanopic lux (EML)

39
Q

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. (term)

A

Spatial daylight autonomy (sDA)

40
Q

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.

A

Luminance

41
Q

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

A

Color rendering index (CRI)

42
Q

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

A

Variable opacity glazing

43
Q

What is the correct term for keeping the body’s internal clocks synchronized?

A

Circadian photoentrainment

WELL AP 7.11.2020 (10 decks)

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