18 Questions
What is the formula for calculating luminance?
Lumens/sq.ft x Reflectance factor
In lighting units, what does Lux measure?
Illumination
What is the illumination level recommended for work stations and offices other than desk areas?
30 footcandles
Which unit is more conveniently used when measuring luminance?
Millilambert
What does a Lambert measure in terms of luminance?
Brightness of a surface transmitting lumens
What is the primary source of illumination in a fluorescent lamp?
Mercury vapor
What is the correct formula to calculate illumination on the floor?
$Light Flux / Area$
Which type of fluorescent lamp is known for its long life span?
Compact Fluorescent Lamp (CFL)
What is the measure of how efficiently a light source produces visible light?
Efficacy
Which type of fluorescent lamp uses a mercury lamp with a phosphor coating?
Fluorescent
What is the factor that indicates the efficiency of a fixture-room combination?
Coefficient of utilization (cu)
Which type of fluorescent lamp has the highest efficacy?
T8
What is the primary difference between efficacy and efficiency in terms of a fluorescent lamp?
Efficacy measures lumens per watt produced, while efficiency is the amount of energy converted to visible light.
Which type of fluorescent lamp is designed to eliminate the delay inherent in preheat circuits by constantly keeping the cathodes energized?
Rapid Start Lamp
Why does the continuous burning of a fluorescent lamp result in a longer lifespan compared to frequent switching on and off?
It prevents wear on the lamp cathode.
Which type of fluorescent lamp has only one pin at each end acting as a switch to break the ballast circuit when the tube is removed?
Instant Start Fluorescent Lamp
What component of a fluorescent lamp tends to be worn out with frequent switching on and off?
Cathode
Why does about 80% of the input energy in a fluorescent lamp get converted into heat?
As a byproduct of light generation.
This quiz covers the history, components, efficiency, efficacy, and lifespan of fluorescent lamps. Learn about the differences between fluorescent and incandescent lamps, as well as how much energy is converted to light versus heat in a fluorescent lamp.
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