CEM Lighting Systems and Controls 3

Question 1

A lighting energy audit should measure which of the following?

Accepted Answer

Lamp wattage, fixture count, operating hours, and ballast losses

Answer

Only lamp wattage

Answer

Color temperature and CRI only

Answer

Lumen output at the lamp only

Question 2

What is the primary benefit of installing occupancy sensors in private offices?

Accepted Answer

Energy savings of 20-60% by eliminating lighting in unoccupied spaces

Answer

Improved color rendering

Answer

Increased lamp life through higher voltage

Answer

Reduced ballast harmonics

Question 3

Which metric best represents the overall efficiency of a luminaire including lamp and ballast?

Accepted Answer

Luminaire efficacy (system lumens per watt)

Answer

Lamp lumens per watt

Answer

Footcandles at the task plane

Answer

Color Rendering Index

Question 4

Delamping (removing excess lamps) is a quick energy-saving measure that is most effective when:

Accepted Answer

Illuminance levels significantly exceed IES recommended values

Answer

Illuminance levels are below IES recommended values

Answer

All occupants work day shifts only

Answer

Lamps are approaching end of life

Question 5

The Illuminating Engineering Society (IES) publishes recommended illuminance levels primarily to:

Accepted Answer

Define minimum light levels for safe and productive visual tasks

Answer

Maximize energy consumption in buildings

Answer

Set maximum allowed lamp wattage

Answer

Regulate color temperature of commercial lighting

Question 6

Dimming controls on fluorescent and LED systems typically save energy in proportion to:

Accepted Answer

The reduction in light output (approximately linear)

Answer

The square of the dimming level

Answer

The cube of the voltage reduction

Answer

Luminaire color temperature change