CLD Outdoor Lighting 2

Question 1

Which IES light trespass standard defines the maximum allowable vertical illuminance at a neighboring property line?

Accepted Answer

IES G-1-03

Answer

IES G-1-03 (Guideline for Security Lighting) and its successor documents specify maximum vertical illuminance limits at property lines to control light trespass.

Question 2

A coastal boardwalk project must protect sea turtle nesting habitat. Which lamp color is most appropriate for fixtures near the beach?

Accepted Answer

Amber (590nm peak)

Answer

Amber light peaking around 590nm has minimal impact on sea turtle navigation instincts, which are most disrupted by short-wavelength (blue/white) light.

Question 3

What is the primary purpose of a photometric cutoff classification (Full Cutoff, Cutoff, Semi-Cutoff) in outdoor luminaires?

Accepted Answer

To control the distribution of light above the horizontal plane

Answer

Cutoff classifications describe how much light a luminaire emits above the horizontal (90°), directly controlling sky glow and glare contributions.

Question 4

In outdoor sports lighting design, the term 'uniformity ratio' most commonly refers to which measurement?

Accepted Answer

Average to minimum illuminance (Eavg/Emin)

Answer

Sports lighting uniformity is expressed as average-to-minimum (Eavg/Emin), with IES RP-6 specifying maximum allowable ratios for various sports and competition levels.

Question 5

A pedestrian pathway luminaire is specified at 4m mounting height. Light levels comply but glare complaints arise. Which modification best addresses glare without replacing fixtures?

Accepted Answer

Install a house-side shield to block light toward pedestrians

Answer

House-side shields block direct view of the lamp source from pedestrians' line of sight, reducing disability glare without altering the overall photometric distribution significantly.

(CLD) Certified Lighting Designer Practice Test

(CLD) Certified Lighting Designer Practice Test

CLD Outdoor Lighting 2