CLD Daylighting Design 3

Question 1

A designer specifies electrochromic glazing in a daylighting system. What is the primary performance advantage over static tinted glass?

Accepted Answer

Dynamically variable visible transmittance that adapts to changing sky conditions

Answer

Electrochromic glazing can electrically switch its visible transmittance across a range of states, optimizing daylight admission and glare control dynamically rather than using a fixed tint.

Question 2

Which LEED v4 credit requires spatial Daylight Autonomy (sDA) and Annual Sunlight Exposure (ASE) as the primary simulation metrics?

Accepted Answer

IEQ Credit: Daylight

Answer

LEED v4's IEQ Credit: Daylight uses sDA300/50% and ASE1000,250h as the primary metrics for Option 1 (simulation) compliance.

Question 3

What does an Annual Sunlight Exposure (ASE) value of ASE1000,250h indicate?

Accepted Answer

The percentage of floor area receiving at least 1,000 lux for at least 250 occupied hours per year

Answer

ASE1000,250h is the percentage of the regularly occupied floor area that receives direct sunlight of 1,000 lux or more for at least 250 occupied hours per year, indicating a glare/discomfort risk.

Question 4

In daylighting design, what is 'veiling reflections' and how does daylighting position affect it?

Accepted Answer

Reflections from luminaires that reduce task contrast; daylighting from the side minimizes them on horizontal tasks

Answer

Veiling reflections are specular reflections of bright sources (including windows) on task surfaces that reduce contrast; sidelighting rather than overhead lighting reduces them on horizontal work surfaces.

Question 5

Which window orientation typically provides the most uniform and controllable daylight with the least direct solar gain in the Northern Hemisphere?

Accepted Answer

North-facing

Answer

North-facing windows in the Northern Hemisphere receive only diffuse skylight throughout the year with no direct solar penetration, providing consistent and controllable illuminance.

(CLD) Certified Lighting Designer Practice Test

(CLD) Certified Lighting Designer Practice Test

CLD Daylighting Design 3