CEM Lighting Systems 3

Question 1

Which lamp type produces light through an electrical discharge in a gas-filled tube without a filament, making it suitable for cold storage facilities?

Accepted Answer

Fluorescent

Answer

Fluorescent lamps use electrical discharge through mercury vapor and phosphor coating, though performance can decrease in very cold temperatures.

Question 2

In a lighting retrofit economic analysis, simple payback period is calculated as:

Accepted Answer

Installation cost ÷ annual energy savings

Answer

Simple payback = Initial cost / Annual savings, giving the number of years to recover the investment.

Question 3

What is the primary advantage of occupancy sensors in private offices compared to open-plan areas?

Accepted Answer

Greater energy savings due to predictable single-occupant patterns

Answer

Private offices have predictable vacancy periods, allowing occupancy sensors to turn lights off completely when the occupant is absent, yielding larger savings.

Question 4

Ballast factor (BF) greater than 1.0 for a fluorescent ballast indicates:

Accepted Answer

The ballast drives the lamp above rated lumen output

Answer

A BF > 1.0 means the ballast drives the lamp to produce more lumens than the rated (reference ballast) value.

Question 5

A parking garage uses 175W HID fixtures running 4,000 hours/year at $0.12/kWh. Replacing with 60W LED fixtures saves how much annually per fixture?

Accepted Answer

$55.20

Answer

Savings = (175-60)W × 4,000h / 1,000 × $0.12 = 115 × 4 × 0.12 = $55.20 per fixture annually.

(CEM) Certified Emergency Manager Practice Test

(CEM) Certified Emergency Manager Practice Test

CEM Lighting Systems 3