FREE CEM Test Lighting Systems Questions and Answers

Question 1

An art gallery is upgrading its lighting to ensure the colors of the artwork are perceived as accurately as possible under artificial light.
Which of the following lighting metrics is the most critical to consider for this application?

Accepted Answer

Color Rendering Index (CRI)

Answer

Correlated Color Temperature (CCT)

Answer

Luminous Efficacy (lm/W)

Answer

Illuminance (foot-candles)

Question 2

A 12-watt LED lamp produces a total of 1,620 lumens. What is the luminous efficacy of this lamp?

Accepted Answer

135 lumens/watt

Answer

0.007 W/lumen

Answer

19,440 lumen-watts

Answer

150 watts

Question 3

A 10,000 square foot warehouse space is illuminated by 80 high-bay fixtures. Each fixture consumes a total of 150 watts (including the driver). What is the Lighting Power Density (LPD) for this space?

Accepted Answer

1.2 W/ft²

Answer

0.83 W/ft²

Answer

1.5 W/ft²

Answer

12.0 W/ft²

Question 4

Which of the following light sources is generally characterized by the longest rated service life, often exceeding 50,000 hours?

Accepted Answer

Solid-State Lighting (LED)

Answer

Metal Halide

Answer

Incandescent

Answer

Linear Fluorescent

Question 5

A facility manager is implementing a lighting maintenance program for a large office building with thousands of fluorescent lamps. Which of the following is a primary advantage of a group relamping strategy over a spot relamping strategy?

Accepted Answer

Reduced labor costs per lamp and more uniform light levels.

Answer

Maximizes the operational life of every individual lamp.

Answer

Significantly lower upfront material cost.

Answer

Requires less planning and specialized equipment.

Question 6

In a large warehouse with high ceilings and aisles that have intermittent forklift and personnel traffic, which lighting control strategy would yield the highest energy savings while maintaining safety?

Accepted Answer

Networked luminaire-level controls with integrated occupancy and daylight sensors.

Answer

A central timeclock shutting off all lights after business hours.

Answer

Manual wall switches located at the end of each aisle.

Answer

Photocells that turn lights on only when it is dark outside.

An art gallery is upgrading its lighting to ensure the colors of the artwork are perceived as accurately as possible under artificial light.Which of the following lighting metrics is the most critical to consider for this application?

An art gallery is upgrading its lighting to ensure the colors of the artwork are perceived as accurately as possible under artificial light.
Which of the following lighting metrics is the most critical to consider for this application?