CEA CEA Lighting & Environmental Factors

Question 1

What is the recommended illuminance level (in foot-candles) for general office work according to IESNA guidelines?

Accepted Answer

30–50 fc

Answer

10–20 fc

Answer

75–100 fc

Answer

150–200 fc

Question 2

Which type of lighting is MOST likely to cause veiling reflections on computer screens?

Accepted Answer

Overhead fluorescent luminaires positioned directly above the screen

Answer

Indirect uplighting

Answer

Task lighting aimed from the side

Answer

Natural daylight from a side window

Question 3

What is the primary ergonomic concern when the luminance ratio between a task and its immediate surround exceeds 3:1?

Accepted Answer

Visual fatigue from repeated pupil adaptation

Answer

Increased glare disability

Answer

Reduced color rendering index

Answer

Flicker sensitivity

Question 4

Thermal discomfort in an office is MOST directly evaluated by which combination of environmental parameters?

Accepted Answer

Radiant temperature, air temperature, humidity, and air velocity

Answer

Air temperature and CO₂ concentration

Answer

Lighting level and noise level

Answer

Barometric pressure and humidity only

Question 5

According to OSHA and NIOSH guidance, what is the action level for occupational noise exposure over an 8-hour TWA?

Accepted Answer

85 dBA

Answer

80 dBA

Answer

90 dBA

Answer

95 dBA

Question 6

Which lighting metric BEST describes the ability of a light source to reveal colors accurately compared to a reference illuminant?

Accepted Answer

Color Rendering Index (CRI)

Answer

Correlated Color Temperature (CCT)

Answer

Luminous Efficacy

Answer

Illuminance (lux)