CEM Lighting Systems and Controls

Question 1

What is the efficacy of a standard T8 fluorescent lamp?

Accepted Answer

75-95 lumens/watt

Answer

50-60 lumens/watt

Answer

100-120 lumens/watt

Answer

130-150 lumens/watt

Question 2

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

Accepted Answer

Occupancy sensor control

Answer

Dimming control

Answer

Daylight harvesting

Answer

Lumen depreciation control

Question 3

Daylight harvesting saves energy by:

Accepted Answer

Dimming electric lights in proportion to available natural light

Answer

Increasing lamp wattage during daytime

Answer

Using mirrors to redirect sunlight

Answer

Switching to a warmer color temperature during daylight hours

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

The color temperature of a lamp in Kelvin

Answer

The lumen output per watt of a lamp

Answer

The beam angle of a directional luminaire

Question 5

LED lighting saves energy over fluorescent primarily because it:

Accepted Answer

Converts more electrical energy to light with less heat loss

Answer

Operates at higher voltage

Answer

Uses a longer warm-up cycle

Answer

Requires ballasts that reduce power factor

Question 6

A power factor correction capacitor added to a fluorescent lighting circuit will:

Accepted Answer

Reduce reactive power demand and improve power factor

Answer

Increase lamp lumens output

Answer

Increase lamp operating temperature

Answer

Extend lamp life by reducing voltage