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Practical Applications of Lighting

Terms in this set (33)

Two identical low-bay HID fixtures are to be mounted at a height of 18'. If these fixtures have a spacing criterion (SC) of 1.5, the maximum distance that should exist between them to provide proper lighting is __________ feet.
Twenty Seven (27)
True or False. Trolley busways cannot be used outdoors.
True
One lumen falling on one square foot of surface produces an illumination of __________.
One(1) Foot-Candle
Bollard fixtures are commonly used to light
Walkways and Grounds
Lighting that directs well focused illumination to a specific surface such as a kitchen counter is classified as __________ lighting.
Task
Lighting fixtures that distribute 40% to 60% of their emitted light downward and the balance upward, sometimes with a strong horizontal component, are classified as __________ lighting fixtures.
General Diffuse
Lighting fixtures installed in offices, stores, and public buildings are classified as being used in __________ Service.
Commercial
Ceiling fixtures equipped with diffusers are typically used to provide __________ Lighting.
General Diffused
Industrial fluorescent fixtures with non aperture reflectors typically direct what percentage of their light downward toward the work surface?
100%
NEC Article 500 governs the application and installation of __________.
Lighting in Hazardous Locations
A major advantage of using​ induction-type lamps is​ _____.
extended lamp life
Ellipsoidal and parabolic are shapes of​ _____ used on recessed lighting fixtures.
Reflectors
The reflector that is installed on a recessed lighting fixture determines the direction of the light. There are a number of reflectors that may be incorporated into a recessed fixture.
True or False. A diffuser is used to direct light into a​ sharp, single beam such as a spotlight.
False. Diffusers are generally used to direct light in all directions.
​_____ are not recommended for use in open office areas where computer terminals are used because they can cause unacceptable reflections on the screen.
Diffusers
Since diffusers scatter the light emitted by the fixture lamps before it leaves the​ fixture, they are not recommended for lighting above computer terminals.
If you are looking to direct the majority of lighting upward in a​ room, you would most likely choose​ _____ lighting.
Indirect
Indirect lighting distributes​ 90% to​ 100% of the emitted light upward.
True or False. LEDs can be used in shallow puck luminaires.
True
LEDs, besides their use as efficient replacements of other lamp types in recessed can​ luminaires, have allowed the creation of a new shallow​ puck-type recessed luminaire.
Fixtures that are designed to install directly in the grid of a​ grid-type ceiling are called​ _____.
troffers
A louver is a type of​ reflector. parabolic is a type of​ louver.
A troffer is a recessed fluorescent fixture that is designed to install directly in the grid of a​ grid-type ceiling.
A common use for a​ _____ fixture is over a personal computer or video display terminal.
suspended
This type of wiring system can be mounted​ end-to-end using special connectors.
Channel system
The channel system provides both support and a wiring raceway.
True or False. A wraparound fixture is a type of HID fixture.
False
A wraparound fixture is a type of fluorescent fixture.
Lighting fixtures made for use in corrosive environments are typically constructed with​ _____ or nonmetallic housings.
stainless steel
Ferrous steel and iron alloy will corrode if exposed to corrosive environments. Stainless steel will not.
True or False. Foot-candle and candlepower are interchangeable and have the same definition.
False
The foot-candle measures luminance on a given surface and the candlepower measures the intensity of light.
Art museums typically require various forms of​ _____ lighting to direct lighting to specific pieces of art.
accent
Corridor lighting levels should provide at least​ _____ of the luminance of adjacent areas.
20%
Corridors are considered public areas and do not require the same amount of lighting as main​ areas, but they should provide a minimum of​ 20% of the lighting of adjacent areas.
A​ cobra-head is a type of​ _____.
pole-mounted fixture
​Pole-mounted lighting fixtures with​ oval-shaped reflectors mounted on long arms are commonly used for roadway​ applications, and because of their appearance they are often referred to as cobra head fixtures.
Outdoor sports lighting often include the installation of​ _____ lighting.
flood
True or False. Color temperature is affected in fluorescent lamps during dimming.
False
Dimming does not affect color temperature in fluorescent lamps.
An electronic sensor that can be used to turn off lights when there is sufficient daylight is a type of​ _____.
photo sensor
Electronic photo sensors can be used to provide daylight harvesting.
An EMS that uses radio signals to control selected devices is​ a(n) _____ system.
RF (Radio frequency)
In​ general, which one of the following statements is TRUE​ regarding the required disconnecting means for a fluorescent​ luminaire?

Only the ungrounded conductor to the ballast is required​ to be disconnected when connected to multiwire branch circuits.

The disconnecting means shall be external to the luminaire.

The disconnecting means shall not be external to the luminaire.

The disconnecting means shall simultaneously break all supply conductors to the​ ballast, including the grounded​ conductor, when connected to a multiwire branch circuit.
The disconnecting means shall simultaneously break all supply conductors to the​ ballast, including the grounded​ conductor, when connected to a multiwire branch circuit.
For other than listed​ low-voltage luminaires not requiring​ grounding, all electrical equipment within a fountain or within​ _____ of the inside wall of a fountain shall be grounded.
5 feet
For low voltage lighting systems operating at 30 volts or​ less, the output circuits of the power supply are to be rated for NOT more than​ _____ under all load conditions.
25 amperes
Pendant conductors having a length of at LEAST​ _____ or​ more, shall be twisted together where not cabled in a listed assembly.
3 feet
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