CEM Lighting Systems and Controls

Question 1

What is the efficacy of a standard T8 fluorescent lamp?

Accepted Answer

75-95 lumens/watt

Answer

Standard T8 fluorescent lamps produce approximately 75-95 lumens per watt, making them significantly more efficient than incandescent sources.

Question 2

Which lighting control strategy turns off lights when no occupancy is detected?

Accepted Answer

Occupancy sensor control

Answer

Occupancy sensor control automatically switches lights off when no motion or presence is detected, reducing energy waste in unoccupied spaces.

Question 3

Daylight harvesting saves energy by:

Accepted Answer

Dimming electric lights in proportion to available natural light

Answer

Daylight harvesting uses photosensors to dim or switch off electric lighting when sufficient natural daylight is available, reducing electricity consumption.

Question 4

What does the Color Rendering Index (CRI) measure?

Accepted Answer

How accurately a light source renders colors compared to a reference source

Answer

CRI measures how faithfully a light source renders object colors compared to a natural reference source, with a perfect score of 100.

Question 5

LED lighting saves energy over fluorescent primarily because it:

Accepted Answer

Converts more electrical energy to light with less heat loss

Answer

LEDs convert a much higher percentage of electrical input into visible light, generating far less wasted heat than fluorescent or incandescent sources.

CEM - Certified Energy Manager Practice Test

CEM - Certified Energy Manager Practice Test

CEM Lighting Systems and Controls