Interior Design Lighting Design & Illumination

Question 1

What does the Color Rendering Index (CRI) measure?

Accepted Answer

How accurately a light source renders colors compared to natural light

Answer

CRI measures how accurately a light source renders colors compared to a reference natural light source, on a scale of 0–100.

Question 2

Which type of lighting provides general, overall illumination for an entire room?

Accepted Answer

Ambient lighting

Answer

Ambient lighting provides general, overall illumination for a space and serves as the base layer of any lighting design.

Question 3

What unit is used to measure illuminance — the amount of light falling on a surface?

Accepted Answer

Foot-candle

Answer

Foot-candles (or lux in SI units) measure illuminance — the quantity of light striking a surface per square foot.

Question 4

Which color temperature range (in Kelvin) is typically described as 'warm white' and preferred in residential settings?

Accepted Answer

2,700K–3,000K

Answer

Warm white light falls in the 2,700K–3,000K range, producing a yellowish, cozy tone commonly used in homes and hospitality spaces.

Question 5

What is the primary purpose of task lighting in interior design?

Accepted Answer

To provide focused illumination for specific activities

Answer

Task lighting provides concentrated, focused light for activities such as reading, cooking, or working at a desk.

Interior Design Practice Test