Lighting 1 Flashcards
The color temperature system is based on the color changes of a theoretical “blackbody radiator” as it is heated from a cold-black to a white-hot state.
True
False
True
Light is produced in a fluorescent lamp by passing an electric arc between tungsten cathodes in a tube filled with a ? and other gases.
a.
atomic particles
b.
high pressure mercury vapor
c.
low pressure mercury vapor
d.
neon
C
Fluorescent and HID dimming may be used in ? systems to compensate for available natural light.
a.
daylight harvesting
b.
daylight saving
c.
load compensation
d.
all of the above
A
Color temperature describes whether light appears warm (reddish), neutral, or cool (bluish). The term relates to the light emitted from a metal object heated to the point of incandescence, measured in Kelvin (K).
True
False
True
CRI describes the ? of the light on a scale of 0 to 100, with 0 being poor color rendering and 100 providing perfect color rendering.
a.
efficiency
b.
energy
c.
quality
d.
temperature
C
All white light sources can be evaluated by ? and CRI.
a.
color temperature
b.
efficiency
c.
light level
d.
power consumed
A
Natural light is considered to have a CRI of ? .
a.
25
b.
50
c.
75
d.
100
D
Photo degradation is the process by which UV light causes bleaching of pigments, fabrics, or other materials.
True
False
True
A(n) ? provides both shading and indirect lighting for a space, increasing the amount of natural light penetration.
a.
clerestory
b.
light shelf
c.
overhang soffit
d.
skylight
B
A light shelf is a side lighting technique that can increase the depth of penetration of daylight by ? or more.
a.
100%
b.
125%
c.
150%
d.
175%
A
While utilizing daylighting designs, the best way to permit energy savings using automatic lighting controls is to dim fluorescent lighting rather than switching fluorescent lamps on and off to compensate for the amount of natural light entering a space.
True
False
True
A(n) ? starts and regulates power to a fluorescent lamp.
a.
ballast
b.
capacitor
c.
electronic starter
d.
relay
A
Which type of HID lamp is the most efficacious?
a.
Ceramic metal halide
b.
High pressure sodium
c.
Low pressure sodium
d.
Mercury vapor
e.
Metal halide
C
What type of luminaires are usually selected to convey a sense of drama to the space?
a.
Adjustable luminaires
b.
Asymmetric luminaires
c.
Diffuse luminaires
d.
Direct luminaires
D
? tend to create a comfortable, low-contrast soft light that psychologically enlarges space.
a.
Adjustable luminaires
b.
Asymmetric luminaires
c.
Diffuse luminaires
d.
Indirect luminaires
D
