Lighting 2 Flashcards
When doing a lighting survey of the client’s existing system, footcandle measurements need to be made on both horizontal and vertical surfaces.
True
False
True
The simplest form of retrofit is to ? .
Select one:
a.
upgrade the controls
b.
upgrade the fixtures
c.
upgrade the lamps
d.
all of the above
C
? buildings attempt to minimize the negative impact on the surrounding environment, including the nighttime sky.
Select one:
a.
Code compliant
b.
Commercial
c.
Sustainable
d.
All of the above
C
A device for starting and regulating fluorescent and high intensity discharge (HID) lamps is called a(n) ? .
Select one:
a.
autotransformer ballast
b.
ballast
c.
core-and-coil ballast
d.
preheat ballast
B
? is the lamp light output (lumens) measured at 40% of rated lamp life for fluorescent, compact fluorescent, and metal halide lamps and 50% of rated life for mercury and HPS lamps.
Select one:
a.
Footcandle
b.
Initial lumen
c.
Lumens/Watt (lpw)
d.
Mean lumens
D
? is the decrease in lumen output of a light source over time.
Select one:
a.
Initial lumen
b.
Lumen depreciation
c.
Lumen/Watt (lpw)
d.
Mean lumen
B
? is a measure of how well a lamp maintains its lamp output as it ages.
Select one:
a.
Design lumen
b.
Initial lumen
c.
Lumen depreciation
d.
Mean lumen
C
An electronic ballast that provides precise heating of the lamp filaments and tightly controls the pre-heat duration before applying starting voltage to ignite the lamp is called a(n) ? .
Select one:
a.
Autotransformer ballast
b.
Core-and-coil ballast
c.
Preheat ballast
d.
Programmed start ballast
D
What type of fluorescent lamp requires filament heating before igniting and producing light?
Select one:
a.
Instant start lamp
b.
Probe start lamp
c.
Pulse start lamp
d.
Rapid start lamp
D
The operation of a(n) ? relies upon an electrical arc passing between two electrodes, one on each end of the lamp. This arc passes through a glass tube coated with phosphor in a mixture of vaporized mercury and purified gases—mainly Argon or Krypton. The resulting ultraviolet waves react with the phosphor to produce a glow (fluorescence) and emit visible light.
Select one:
a.
fluorescent lamp
b.
high-intensity discharge lamp
c.
incandescent lamp
d.
light-emitting diode lamp
A
? lumens tell you the amount of light that the lamp produces after it has operated for approximately 40% of its rated life.
Select one:
a.
Average
b.
Design
c.
Running
d.
Startup
B
Lamp lumen depreciation refers to the light output from a fluorescent lamp that diminishes as the lamp is used.
Select one:
True
False
True
The ? is determined by taking the ratio of light output from a lamp operated on a commercial ballast to the light output of that same lamp operated on a “reference ballast“ as specified by ANSI standards.
Select one:
a.
ballast factor
b.
lamp current crest factor
c.
lumen factor
d.
luminance factor
A
What type of electronic ballast should be used when frequent switching applications are required (as in use with occupancy sensors)?
Select one:
a.
Autotransformer ballast
b.
Core-and-coil ballast
c.
Preheat ballast
d.
Programmed start ballast
D
? is the measure of light output of an HID lamp operated by a commercial ballast as compared to the light output of a lamp operated by a laboratory standard reference ballast.
Select one:
a.
Ballast factor
b.
Mean lumens
c.
Power factor corrected ballast
d.
Striation
A
The most common applications of the ? ballast are billboard and road sign lighting.
Select one:
a.
outdoor weatherproof
b.
preheat
c.
programmed start
d.
rapid start
A
The F-Can ballast is listed for indoor use, primarily to minimize inherent ballast noise.
Select one:
True
False
True
Lantern-type fixtures mounted on slender poles often require ? ballasts that fit into the poles.
Select one:
a.
indoor enclosed
b.
encapsulated core and coil
c.
outdoor weatherproof
d.
postline
D
Which ballast circuit provides the best lamp wattage regulation, but carries an increase in ballast size, ballast losses, and price?
Select one:
a.
Constant wattage isolated
b.
High reactance autotransformer
c.
Reactor
d.
Regulated lag
D
One of the most important characteristics of each particular ballast circuit is the degree to which it controls the lamp ? and, subsequently, the light output when the input line voltage changes.
Select one:
a.
current
b.
resistance
c.
voltage
d.
wattage
D
Lamp manufacturers recommend ? electronic ballasts to drive the new generation of ceramic metal halide lamps.
Select one:
a.
high frequency
b.
high resistance
c.
low frequency
d.
low resistance
C
Lamp manufacturers recommend ? electronic ballasts to drive the new generation of ceramic metal halide lamps.
Select one:
a.
high frequency
b.
high resistance
c.
low frequency
d.
low resistance
C
Which of the following is NOT a basic type of LED?
Select one:
a.
Indicator-type LEDs
b.
Illuminator-type LEDs
c.
Illustrator-type LEDs
d.
None of the above
C
The RGB color model is a subtractive color model, which applies to light emitted directly from an illuminant.
Select one:
True
False
False
