Lighting Systems and Controls Flashcards
6 cards from real CEM practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Lighting Systems and Controls flashcards as text
What is the efficacy of a standard T8 fluorescent lamp?
Answer: 75-95 lumens/watt
Standard T8 fluorescent lamps produce approximately 75-95 lumens per watt, making them significantly more efficient than incandescent sources.
Which lighting control strategy turns off lights when no occupancy is detected?
Answer: Occupancy sensor control
Occupancy sensor control automatically switches lights off when no motion or presence is detected, reducing energy waste in unoccupied spaces.
Daylight harvesting saves energy by:
Answer: Dimming electric lights in proportion to available natural light
Daylight harvesting uses photosensors to dim or switch off electric lighting when sufficient natural daylight is available, reducing electricity consumption.
What does the Color Rendering Index (CRI) measure?
Answer: How accurately a light source renders colors compared to a reference source
CRI measures how faithfully a light source renders object colors compared to a natural reference source, with a perfect score of 100.
LED lighting saves energy over fluorescent primarily because it:
Answer: Converts more electrical energy to light with less heat loss
LEDs convert a much higher percentage of electrical input into visible light, generating far less wasted heat than fluorescent or incandescent sources.
A power factor correction capacitor added to a fluorescent lighting circuit will:
Answer: Reduce reactive power demand and improve power factor
Capacitors supply reactive power locally, reducing the reactive current drawn from the utility and improving the circuit power factor.