NCIDQ Lighting Design 2

Question 1

A luminaire's efficacy is expressed as which unit of measurement?

Accepted Answer

Lumens per watt

Answer

Luminaire efficacy is measured in lumens per watt (lm/W), representing how efficiently a fixture converts electrical energy into visible light output.

Question 2

According to IES recommendations, what is the typical illuminance range for general office tasks such as reading and computer work?

Accepted Answer

30–50 footcandles

Answer

IES recommends 30–50 footcandles (300–500 lux) for general office tasks, with higher levels for detailed or visually demanding work.

Question 3

In healthcare examination rooms, which lighting characteristic is most critical for accurate diagnosis and skin tone assessment?

Accepted Answer

High CRI (90+) for accurate color rendering

Answer

A high CRI of 90 or above is essential in examination areas so that clinicians can accurately assess skin tone, tissue color, and other color-dependent clinical indicators.

Question 4

Which lighting technique involves aiming light parallel to a textured wall surface to emphasize its surface relief and texture?

Accepted Answer

Grazing

Answer

Grazing places fixtures very close to a textured surface and directs light at an oblique angle, casting dramatic shadows that accentuate texture and surface relief.

Question 5

ASHRAE 90.1 establishes energy efficiency requirements for commercial buildings by limiting which lighting metric?

Accepted Answer

Lighting Power Density (LPD) in watts per square foot

Answer

ASHRAE 90.1 sets Lighting Power Density (LPD) limits in watts per square foot for different building and space types to reduce overall energy consumption.

NCIDQ Exam Practice Test

NCIDQ Exam Practice Test

NCIDQ Lighting Design 2