LIGHT-2 preconditions

Question 1

What is circadian rhythm?

Answer 1

internal clocks that synchronize physiological functions on a roughly 24-hour cycle

Question 2

Disruption or desynchronization of the circadian rhythm has been linked with (4)

Answer 2

obesity, diabetes, depression and metabolic disorders

Question 3

Exposure to bright light at night is associated with circadian phase disruption, including light from bright screens, which in turn can cause negative health effects, such as (4)

Answer 3

breast cancer and metabolic and sleep disorders

and can contribute to the disruption of the circadian rhythm

Question 4

The WELL Light concept aims to provide a lighting environment that reduces circadian phase disruption, improves sleep quality and positively impacts mood and productivity by

Answer 4

Integrating daylight and electric light
to create lighting strategies focused on human health,
along with traditional requirements for
visual acuity and comfort.

Question 5

The WELL Light concept- how many and which preconditions?

Answer 5

Feature L01 Precondition
Light Exposure

Feature L02 Precondition
Visual Lighting Design

Question 6

Feature L02 Precondition
Visual Lighting Design

(aim/reference/alternative option)

Answer 6

Provide Visual Acuity

Option 1: Visual lighting design
The illuminance thresholds take into consideration the tasks and the age groups of the occupants

All spaces ( comply with the illuminance thresholds specified in one of the following lighting reference guidelines:

1. IES Lighting Handbook 10th Edition.
2. EN 12464-1&2: 2011. British standard
3. ISO 8995-1:2002(E) (CIE S 008/E:2001). international
4. GB50034-2013. Chinese
5. CIBSE SLL Code for Lighting. global

OR

Option 2: Predetermined light levels
50% occupants under 65/ Offices and classrooms: minimum 30 fc (300 lux) at task surface./ other spaces 10 fc at the floor plan

FC-foot candle- x 10 = lux

Question 7

Feature L01 Precondition
Light Exposure
4 options

Answer 7

Provide indoor light:
Option 1: Daylight simulation
Option 2: Interior layout
Option 3: Building design
envelope glazing area is no less than 7% of the regularly occupied floor area / 20 m both env.glazi no opaqua constr)
Option 4: Circadian lighting design (1 point F03)

Question 8

L01 Precondition
Light Exposure  
Option 2: Interior layout 
(two alternatives- 
At least ?? % of the regularly occupied area is within a ?? m horizontal distance of envelope glazing in each floor and/or in each individual unit.
OR

Common spaces have unassigned seating and can accommodate at least ?? % of regular occupants at any given time. At least ?? % of all seating in the spaces is within a ?? m horizontal distance of envelope glazing.

Answer 8

At least 30% of the regularly occupied area is within a 6 m horizontal distance of envelope glazing in each floor and/or in each individual unit.

OR

Common spaces have unassigned seating and can accommodate at least 15% of regular occupants at any given time. At least 70% of all seating in the spaces is within a 5 m horizontal distance of envelope glazing.

Question 9

P-F01 Light Exposure
Provide Indoor Light through
Option 1: Daylight simulation

The project demonstrates, through computer simulations, that one of the following conditions are achieved: ( calculations per which 2 standards?..)

Regularly occupied spaces achieve one of the following targets:

Common spaces that have unassigned seating for at least 15 % of regular occupants

Answer 9

Calculations per IES LM-83-12 OR Calculations per Annex A of CEN 17037:2018

Average sDA 200,40% is achieved for > 30% of regularly occupied floor area
or
Target illuminance 200 lux is achieved for >30% of individual unit area throughout 50% of daylit hours of the year

Average sDA 300,50% is achieved for > 75% of floor area
OR
Target illuminance 300 lux is achieved for >30% of individual unit area and average illuminance 100 lux is achieved for >95% of individual unit area throughout 50% of daylit hours of the year

Question 10

LIGHT- how many and which optimizations

Answer 10

7
L03 Circadian Lighting Design 
L04 Electric Light Glare Control 
L05 Daylight Design Strategies 
L06 Daylight Simulation 
L07 Visual Balance 
L08 Electric Light Quality 
L09 Occupant Lighting Control

Question 11

Since the circadian response of humans to light is dependent on the light that enters the eye, which factors should be considered? (4)

Answer 11

spectral properties of the light,
brightness levels,
duration,
and timing of exposure

Question 12

Feature L03 Circadian Lighting Design

Meet Lighting for Day-Active People
(Max: 3 points)

For workstations used during the daytime, electric lighting is used to achieve the following thresholds:

Answer 12

The following light levels are achieved for at least 4 hours (beginning by noon at the latest) at a height of 45 cm above the work-plane for all workstations in regularly occupied spaces:
Tier Threshold
Threshold for Projects with Enhanced Daylight Points

1	At least 150 EML [136 M-EDI(D65)] 	OR	The project achieves at least 120 EML [109 M-EDI(D65)] and L05 Part 1 or L06 Part 1 	

2
2	At least 240 EML [218 M-EDI(D65)] 	OR	The project achieves at least 180 EML [163 M-EDI(D65)] and L05 Part 1 or L06 Part 1

Question 13

Feature L04 Electric Light Glare Control

Manage Glare from Electric Lighting (1 point
3)

Answer 13

• 100% of light is emitted above the horizontal plane.
  
  • Classified with Unified Glare Rating (UGR) of 16 or lower.
  • Luminance that does not exceed 6,000 cd/m2 at any angle between 45 and 90 degrees from nadir.

Question 14

Feature L04 Electric Light Glare Control
Minimize glare caused by electric light
FOR INDUSTRIAL- (UGR less than?)

Answer 14

Unified Glare Rating (UGR) of 19 or lower.

Question 15

Feature L05 Daylight Design Strategies

Provide daylight exposure indoors through design strategies. (2)

Answer 15

implement daylight plan

integrate solar shading

Question 16

L05 Daylight Design Strategies
part 1 implement daylight plan

The project demonstrates that the following conditions are achieved in each floor:  (Tier	Interior Layout /Façade Design	Points)

Answer 16

1 70% of all workstations are within 7.5 m of transparent envelope glazing.

OR Envelope glazing is no less than 15% of the regularly occupied floor area or individual unit.

&
Visible light transmittance (VLT) of windows is greater than 40%.

2	70% of all workstations are within 5 m of transparent envelope glazing.  OR	Envelope glazing is no less than 25% of the regularly occupied floor area or individual unit. 

&
Visible light transmittance (VLT) of windows is greater than 40%.

Question 17

L05 Daylight Design Strategies
part 2 integrate solar shading

The following requirements are met in regularly occupied spaces; All vertical transparent envelope glazing has shading that meets one of the following (2)

Answer 17

Tier Type of Shading Points

1	Manual shading controllable by regular occupants at all times.  Shades are regularly opened once a day for all days that the project is in use	

2 Shading is automated to prevent glare

Question 18

Feature L06 Optimization
Daylight Simulation

The project demonstrates, through computer simulations, that the following conditions are achieved in each floor:

Answer 18

Part 1
Conduct Daylight Simulation (Max: 2 points)

Tier Calculations per IES LM-83-12
Calculations per Annex A of CEN 17037:2018 Points

1	Average sDA300,50% is achieved for > 55% of regularly occupied floor area 	 OR	 Target illuminance of 28 fc is achieved for >50% of the individual unit area throughout 50% of daylit hours of the year 	

2	Average sDA300,50% is achieved for > 75% of regularly occupied floor area 	 OR	 Target illuminance of 28 fc is achieved for >50% of individual unit area and average illuminance 9 fc is achieved for >95% of individual unit area throughout 50% of daylit hours of the year

Question 19

Feature L07 Visual Balance-

Part 1
Balance Visual Lighting (1 point)
through
2 options

Answer 19

Option 1: Parameters for visual balance

Option 2: Design for visual balance

Question 20

Feature L08 Electric Light Quality

2 parts

Answer 20

Part 1
Enhance Color Rendering Quality (1 point)
Part 2
Manage Flicker (2 points)

Question 21

L08 Electric Light Quality
1.part Enhance Color Rendering Quality (1 point)
(3)

All luminaires (except decorative fixtures, emergency lights and other special-purpose lighting) meet at least one of the following color rendering requirements.

If tunable white lighting is used, the requirements are met at 1,000K intervals from the lower end (with a minimum of 2,700K) to the higher end (with a maximum of 5,000k):

K- kelvin colour temperature
2700-3000 warm lights
6000K working bright light

Answer 21

CRI ≥90.

CRI ≥ 80 with R9 ≥ 50.

Color Rendering Index (CRI)
R9 value, TCS 09, or in other words, the red color is the key color for many lighting applications

IES Rf ≥ 78, IES Rg ≥ 100, -1% ≤ IES Rcs,h1 ≤ 15%.

The Illuminating Engineering Society-ANSI/IES TM-30-18
characterizes light source color rendition
Rf (average color fidelity)
Rg (gamut area),
Rcs,h1. (chroma shift for nominally red objects).

Question 22

L08 Part 2
Manage Flicker (2 points)
For All Spaces

All luminaires, in combination with the appropriate controls (except decorative lights, emergency lights and other special-purpose lighting), used in regularly occupied spaces meet at least one of the following flicker requirements:

Answer 22

Classified as “reduced flicker operation” per California Title 24, when tested according to the requirements in Joint Appendix JA-10.8

Recommended practices 1, 2 or 3 as defined by IEEE standard 1789-2015 LED.

Pst LM ≤ 1.0 and SVM ≤ 0.6 for indoor applications per NEMA 77-2017.

Pst. LM, short term flicker severity
metric for visible flicker at frequencies below 80 Hz)
Stroboscopic Visibility Measure (SVM)

ANSI NEMA standards electrical standards

Question 23

Feature L09 Occupant Lighting Control

2 parts

Answer 23

Part 1
Enhance Occupant Controllability (Max: 2 points)

Part 2
Provide Supplemental Lighting (1 point)

Question 24

Part 1
Enhance Occupant Controllability (Max: 2 points)
1: Lighting zones
2: Lighting control system

Answer 24

Ambient lighting systems meet the following requirement:

All regularly occupied spaces contain lighting zones as shown in the table below (note: individual rooms smaller than the areas below and/or that have occupancies less than those listed in the table are considered separate zones):
Tier	Number of Zones	
	Number of Zones	Points
1	One per 60 m2	OR	One per 10 occupants 	

1
2	One per 30 m2 	OR	One per 5 occupants

Question 25

LO7 VISUAL BALANCE

Part 1
Balance Visual Lighting (1 point)
For All Spaces
Option 1: Parameters for visual balance

Ambient lighting in all regularly occupied spaces meets at least three of the following requirements: (4)

Answer 25

1. Horizontal and vertical luminance contrast ratios for an ambient light system is no more than 10 between adjacent independently controlled zones.
2. Illuminance uniformity ratio of at least 0.4 or 1:2.5 (minimum light level: average light level) is achieved on any horizontal task plane within a space.
3. Automatic changes in lighting characteristics, such as light levels, changes in color and distribution take place over a period of 10 minutes.
4. The Correlated Color Temperature (CCT) in each room for similar fixtures is consistent (±200 K) at any point of time.

Question 26

LO7 VISUAL BALANCE

Part 1
Balance Visual Lighting (1 point)
For All Spaces
Option 2: Design for visual balance

Lighting is designed by a lighting professional and takes into account the following considerations: (4)

Answer 26

Luminance ratios on vertical and horizontal adjacent zones.

Illuminance uniformity on horizontal task planes.

Changes in lighting characteristics, such as light levels, changes in color and distribution.

Color temperature of lights used.