CLD Interior Lighting 4

Question 1

A designer wants to create visual interest on a rough stone wall using grazing light. The fixture should be positioned:

Accepted Answer

Very close to the wall surface, nearly parallel to it

Answer

Grazing light placed very close to and nearly parallel to a textured surface emphasizes surface relief by casting dramatic shadows across irregularities.

Question 2

Which ASHRAE/IES standard is most directly applicable to interior lighting energy compliance for new commercial buildings in the US?

Accepted Answer

ASHRAE 90.1

Answer

ASHRAE 90.1 (Energy Standard for Buildings) sets the Lighting Power Density (LPD) limits and control requirements that govern energy-compliant interior lighting design in commercial construction.

Question 3

A retail clothing store wants to make merchandise appear most vibrant. Which lamp specification is most appropriate?

Accepted Answer

CRI 90+, 3000K

Answer

High CRI (90+) at a warm 3000K enhances color saturation and rendering accuracy of fabrics, making merchandise appear vibrant and appealing.

Question 4

When calculating average illuminance using the Lumen Method (zonal cavity method), which factor accounts for dirt accumulation and lamp lumen depreciation over time?

Accepted Answer

Light Loss Factor (LLF)

Answer

The Light Loss Factor (LLF) is a composite multiplier that accounts for lamp lumen depreciation, luminaire dirt depreciation, and other factors reducing maintained illuminance over time.

Question 5

In a conference room with video conferencing capabilities, what is a key lighting design concern for the camera-facing wall?

Accepted Answer

Avoiding bright windows or high-luminance backgrounds that cause silhouetting

Answer

Bright backgrounds or windows behind participants create silhouetting on camera; the designer must control luminance ratios to keep faces well-exposed relative to the background.

(CLD) Certified Lighting Designer Practice Test

(CLD) Certified Lighting Designer Practice Test

CLD Interior Lighting 4