CLD Daylighting Design 4

Question 1

A tubular daylighting device (TDD) is most appropriate for which building condition?

Accepted Answer

An interior room with no direct access to an exterior wall or roof

Answer

TDDs (also called sun tubes or tubular skylights) use a reflective tube to transport daylight from a roof-mounted collector to interior rooms that have no direct exterior access.

Question 2

Which exterior shading device is most effective at blocking low-angle morning or afternoon sun on an east or west façade?

Accepted Answer

Vertical fins

Answer

Vertical fins are most effective at blocking low-angle horizontal sun from east and west orientations because they intercept solar azimuth angles that horizontal overhangs cannot block.

Question 3

The Daylight Factor (DF) is defined as the ratio of:

Accepted Answer

Interior illuminance to exterior horizontal illuminance under a standard overcast sky, expressed as a percentage

Answer

Daylight Factor is the ratio of interior illuminance at a point to the simultaneous unobstructed exterior horizontal illuminance under a CIE standard overcast sky, expressed as a percentage.

Question 4

When performing a daylight autonomy (DA) simulation, which threshold illuminance is most commonly used as the minimum acceptable level for office tasks?

Accepted Answer

300 lux

Answer

300 lux is the standard minimum threshold used in spatial Daylight Autonomy (sDA) calculations, reflecting IES recommended task illuminance for general office work.

Question 5

What is the primary purpose of a 'bird-friendly' frit pattern applied to exterior glazing in a daylighting system?

Accepted Answer

To break up the visual continuity of glass and reduce bird-strike mortality

Answer

Ceramic frit or dot patterns applied to glazing interrupt the visual 'invisibility' of glass to birds, reducing fatal collisions while still admitting daylight.

(CLD) Certified Lighting Designer Practice Test

(CLD) Certified Lighting Designer Practice Test

CLD Daylighting Design 4