CEA Lighting & Environmental Factors Flashcards
6 cards from real CEA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CEA Lighting & Environmental Factors flashcards as text
What is the recommended illuminance level (in foot-candles) for general office work according to IESNA guidelines?
Answer: 30–50 fc
IESNA recommends 30–50 foot-candles for general office tasks to reduce eye strain while maintaining adequate visibility.
Which type of lighting is MOST likely to cause veiling reflections on computer screens?
Answer: Overhead fluorescent luminaires positioned directly above the screen
Overhead luminaires positioned directly above a monitor create specular reflections on the screen surface, reducing contrast and increasing visual fatigue.
What is the primary ergonomic concern when the luminance ratio between a task and its immediate surround exceeds 3:1?
Answer: Visual fatigue from repeated pupil adaptation
High luminance ratios force the eye to repeatedly adapt between bright and dim areas, causing visual fatigue over a workday.
Thermal discomfort in an office is MOST directly evaluated by which combination of environmental parameters?
Answer: Radiant temperature, air temperature, humidity, and air velocity
ASHRAE 55 uses operative temperature (combining air and radiant temperature), humidity, and air velocity to assess thermal comfort.
According to OSHA and NIOSH guidance, what is the action level for occupational noise exposure over an 8-hour TWA?
Answer: 85 dBA
NIOSH sets the recommended exposure limit at 85 dBA as an 8-hour TWA, triggering hearing conservation program requirements.
Which lighting metric BEST describes the ability of a light source to reveal colors accurately compared to a reference illuminant?
Answer: Color Rendering Index (CRI)
CRI rates how accurately a light source renders surface colors relative to a reference source on a scale of 0–100.