Light Concept

Question 1

How many adults have chronic sleep disorders?

Answer 1

50-70 million

Question 2

what 6 health risks are sleep deprivation linked to?

Answer 2

diabetes
obesity
depression
heart attack
hypertension
stroke

Question 3

Rods facilitate what type of vision?

Answer 3

peripheral and dim lighting

Question 4

Cones facilitate what type of vision?

Answer 4

daytime and color

Question 5

What are ipRGCs and what type of vision?

Answer 5

Intrinsically Photosensitive Retinal Ganglion Cells

sluggish, non-image forming, see light over long-term, used in circadian system

Question 6

What is our internal clock called that synchronizes physiology over 24-hr cycle?

Answer 6

circadian rhythm

Question 7

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

Answer 7

Zeitgebers - keeps body clock synchronized - circadian photo entrainment

Question 8

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

Answer 8

phase advance - shifting our rhythms forward

Question 9

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

Answer 9

backward - phase delay

Question 10

How many features in Light, and what’s the last precondition?

Answer 10

11 features in Light, 53-63

4 preconditions 53-56

Question 11

What are the last precondition feature #s for the first 4 concepts?

Answer 11

12 for air, 34 for water, 45 for nutrion, 56 for light

Question 12

53 - Visual Lighting Design

Ambient light levels of ____ lux is sufficient - but the requirement is at least ___ lux measured ___ above floor.

Answer 12

300 lux

215 lux 30” above floor

Question 13

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

Answer 13

300-500 lux

Question 14

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

Answer 14

500 SF or 20% of floor area

Question 15

53 - Visual Lighting part 2, Brightness

A narrative is provided that describes how light will be balanced between ___ and ___.

Answer 15

adjacent and non-adjacent spaces in the same room such as
main rooms and ancillary spaces
desk surface and computer screen
across a ceiling

Question 16

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

Answer 16

Equivalent Mealnopic Lux - a measurement of biological effect of light on humans

250 EML at 75% stations, 4’ above floor, 4 hrs/day

Question 17

55. Electric Light Glare - lamp shielding reqs:
    a) less than 20,000 cd/m2 = ____
    b) 20k =
    c) 50k =
    d) 500k =

Answer 17

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

Question 18

What is the luminance limit for bare bulbs?

Answer 18

less than 8,000 cd/m2

Question 19

56 - Solar Glare Control (windows)

what are the two unique glazing options for windows higher than 7ft above floor?

Answer 19

1. interior light shelves
2. film of micro-mirrors
   both reflect light toward the ceiling

Question 20

57 - optional - Low-glare workstation design (screen angle)

computer screens at desks located within ___ft of windows should be oriented ____ degrees perpendicular to winow plane

Answer 20

15 ft

20 degrees

Question 21

58 - optional - Color Quality (all electric light bulbs)

meet a Color Render Index (CRI) Ra (R1-R8) of ____ or higher.

Answer 21

80 Ra

Question 22

What is Color Rendering Index R9 and what’s the requirement?

Answer 22

warmer hues - R9 of 50+

Question 23

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

Answer 23

Ceilings - LRV 0.8 for 80% of surface
Walls - LRV 0.7 for 50%
Furniture - LRV 0.5 for 50%

Question 24

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

Answer 24

Higher LRVs mean they reflect more light

Question 25

60 - optional - Auto shading and dimming

All windows larger than ___ have light sensor triggered shades

Answer 25

6 ft2

Question 26

60 - shading/dimming part 2

fixtures are auto dimmed to ___% or less when the zone is unoccupied, and will ____in response to daylight

Answer 26

20%

dim continuously

Question 27

61 - right to light (window/sunlight)

___% of ALL regularly occupied area is within ___ft of windows

Answer 27

75%, 25’

Question 28

61 - right to light, part 2, workstations

____% of workstations are within ____ft of an atrium/window

Answer 28

75% workstations within 25’ of window

9% within 41’

Question 29

62 - Daylight Modeling (correct exposure to sunlight)

what describes the minimum levels?

Answer 29

Minimum - Spacial Daylight Autonomy - (sDA300, 50%)

meaning 55% of space receives 300 lux 50% of operating hours annualy

Question 30

62 - Daylight Modeling (correct exposure to sunlight)

and what describes the maximum levels?

Answer 30

Maximum - Annual Sunlight Exposure - (ASE1000,250)

meaning 10% of space receives 1000 lux for 250 hours annualy

Question 31

63 - Daylight Fenestration - window sizes, glass opacity

part 1 - proper window- wall ratio

Answer 31

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

Question 32

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

Answer 32

40-60%

Question 33

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

Answer 33

60%

Question 34

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

Answer 34

50%

Question 35

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

Answer 35

2