CLD Luminaire Selection 5

Question 1

A CLD is designing lighting for a library reading room with skylights. Which luminaire selection strategy best supports daylight integration?

Accepted Answer

Continuously dimmable luminaires compatible with daylight harvesting controls

Answer

Continuously dimmable luminaires allow daylight harvesting systems to reduce electric light output proportionally as daylight levels increase, saving energy and maintaining consistent illuminance.

Question 2

For a stairwell egress lighting application under NFPA 101, which luminaire placement strategy meets average illuminance requirements on the tread surfaces?

Accepted Answer

Wall-mounted luminaires at intermediate landing heights positioned to illuminate treads

Answer

Wall-mounted luminaires at intermediate heights provide direct illumination on tread surfaces at angles that reveal step edges, meeting life-safety code requirements.

Question 3

A restaurant designer wants to create a candlelight effect using electric lighting. Which combination of luminaire characteristics best achieves this?

Accepted Answer

Low-lumen 1800K–2200K sources with warm-dim capability

Answer

Warm-dim LED sources that shift toward amber at lower dim levels (1800K–2200K) closely replicate the spectral quality and ambiance of candlelight.

Question 4

A luminaire manufacturer's data lists a System Efficacy of 120 lm/W. How does this differ from LED chip efficacy?

Accepted Answer

System efficacy includes driver losses, thermal losses, and optical losses; chip efficacy does not

Answer

System (luminaire) efficacy accounts for all losses including the LED driver, thermal derating, and optical elements, giving a real-world lm/W figure lower than bare LED chip efficacy.

Question 5

Which luminaire characteristic is most critical when specifying fixtures for a clean room environment (ISO Class 5) in a pharmaceutical facility?

Accepted Answer

Smooth, non-particulate-trapping surfaces and sealed housing

Answer

Clean room luminaires must have smooth, flush, sealed housings that prevent particulate accumulation and can withstand chemical cleaning agents without contaminating the environment.

(CLD) Certified Lighting Designer Practice Test

(CLD) Certified Lighting Designer Practice Test

CLD Luminaire Selection 5