CLD Sustainability 5

Question 1

A healthcare facility wants to reduce its lighting energy while maintaining required illuminance levels. Which combination is most effective?

Accepted Answer

Specify high-efficacy LED luminaires with tunable white and occupancy-based controls

Answer

Pairing high-efficacy LED sources with occupancy-based controls and tunable white capability optimizes energy use while meeting varied task illuminance and circadian needs in healthcare settings.

Question 2

Which of the following best describes 'luminaire efficacy' vs. 'lamp efficacy' in sustainable specification?

Accepted Answer

Luminaire efficacy accounts for optical losses within the fixture, giving a more accurate real-world performance figure

Answer

Luminaire efficacy (lm/W at the fixture level) includes driver losses and optical losses, providing a more realistic measure of delivered light per watt than bare lamp efficacy.

Question 3

Which IES document provides the framework for measuring and reporting annual daylight availability metrics like sDA and ASE?

Accepted Answer

IES LM-83

Answer

IES LM-83 (Approved Method: IES Spatial Daylight Autonomy and Annual Sunlight Exposure) defines the simulation methodology and metrics sDA and ASE for annual climate-based daylight analysis.

Question 4

A lighting designer is asked to verify that an outdoor project meets the IDA/IES Model Lighting Ordinance (MLO) requirements. What does the MLO primarily regulate?

Accepted Answer

Uplight, light trespass, and maximum installed lighting power for exterior zones

Answer

The Model Lighting Ordinance regulates exterior lighting by defining lighting zones and setting limits on uplight (BUG ratings), light trespass, and total installed power to reduce light pollution.

Question 5

In lifecycle cost analysis (LCCA) for lighting, which factor most commonly tips the comparison in favor of LED over a conventional alternative even when first cost is higher?

Accepted Answer

Reduced energy and maintenance costs over the product life

Answer

LED's lower annual energy cost and infrequent lamp replacement typically yield significantly lower total cost of ownership over the system life despite higher upfront prices.

(CLD) Certified Lighting Designer Practice Test

(CLD) Certified Lighting Designer Practice Test

CLD Sustainability 5