Deck 15: Site Lighting

Question 1

How are dimmers used to control lighting?

Answer 1

Dimmers for site lighting are rapidly gaining in popularity. Dimming has the advantage, over other control systems, of being able to lower the lighting and the energy use, while maintaining uniform lighting throughout the area. Energy use can be reduced by 20 percent, or more, of the original value. A dimming system is to be installed on the storage area and the parking lot. A photocell will signal when to turn the lights on; then, a time clock will initiate the dimmers when the high level of lighting is no longer needed. Override switches will be located in convenient places if there is a need to have full lighting at any time.

Question 2

What is the role of color perception when selecting a lamp?

Answer 2

The colors that a person perceives when viewing a building and its surrounding area can be very important. The image of the structure, the automobiles in the parking lot, the materials in the storage yard, and the people entering the building will all have a different appearance when illuminated by light with different color content. The perceived color of any of these objects is affected by the color of the object itself and the color of the light used to illuminate the object. A common example of this is often observed in parking lots where automobiles take on an entirely different look at nighttime when the parking lot lighting is turned on. When it is important that good color discrimination be possible, then lamps must be selected to make this possible. If exact color discrimination is required, the objects to be seen should be viewed under the lamps before the lamps are selected for installation.

Question 3

A contactor is similar to a ____ in that completing the control circuit will energize a coil that closes a set of contacts.

A) toggle switch
B) motor starter
C) pressure switch
D) photocell

Answer 3

B

Question 4

There are four styles of HID lamps: ____, metal halide, high-pressure sodium, and low-pressure sodium.

A) halogen
B) lithium
C) mercury
D) tungsten

Question 5

A ____ is used to deactivate the lighting after the last worker has left.

A) toggle switch
B) photocell
C) pressure switch
D) time clock

Question 6

One type of drawing, which is provided by the luminaire manufacturers to facilitate placement and sizing, is called ____.

A) installation minimization
B) maintenance graphics
C) iso-topological curves
D) iso-illuminance curves

Question 7

What factors affect light distribution?

Question 8

By dividing the ____ rating of a lamp by the watts rating, a value called the efficacy of the lamp is determined.

A) volt
B) lumen
C) ampere
D) color

Question 9

Several procedures for power limitation are common, but the one adopted by the majority of the states is ____.

A) UL Energy Limit
B) TUV Energy Conservation Guide
C) ASHRAE/IES Standard 90
D) COBRA of 1986

Question 10

What is the difference between high-pressure and low-pressure sodium lamps?

Question 11

When considering power control, a ____ may be adequate if the load is small and the control requirements are minimal.

A) toggle switch
B) contactor
C) pressure switch
D) motor starter

Question 12

The amount of light, or ____, needed for exterior areas is dependent upon the type of activity that is to take place in a specific area.

A) luminaire
B) distribution
C) efficacy
D) illuminance

Question 13

Which site has the highest recommended lighting level?

A) roadway
B) storage
C) parking
D) pedestrian

Question 14

What factors need to be considered before selecting a lamp and how can the lighting system be divided up in order to analyze it?

Question 15

The ____ is used to ensure that the site lighting is turned off during the daylight hours.

A) underground cable
B) contactor
C) pressure switch
D) photocell

Question 16

The Edison-type lamp uses a(n) ____ enclosed in a glass bulb to produce the light.

A) halogen rod
B) tungsten filament
C) inert gas
D) wire filament

Question 17

The light sources (lamps) can be placed in three categories: ____, fluorescent, and high-intensity discharge (HID).

A) LED
B) arc-generated
C) halogen
D) incandescent

Question 18

____ conductors, Type UF, are used to service the lighting installation.

A) Direct-burial
B) Solid
C) Coverless
D) Surface

Question 19

The light in fluorescent lamps is produced by ____ bombarding phosphors.

A) electrons
B) neutrons
C) protons
D) muons

Question 20

The ____ lamp has, by far, the shortest life expectancy.

A) incandescent
B) metal halide
C) high-pressure sodium
D) low-pressure sodium