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Kevins Electrical Foundation > Luminaire > Flashcards

Luminaire Flashcards

1
Q

What is a Luminaire?

A

A luminaire is a complete lighting unit consisting of lamps, wiring channel, reflectors, lens, diffusers, and control gear (such as ballasts for gas discharge lamps) where necessary

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2
Q

What is the purpose of the luminaire?

A

To provide the distribution of light

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3
Q

Luminaires are classified on the basis of how they distribute light vertically- either_______or________.

A

Upwards, downwards

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4
Q

The five method of light disbursement are:

A
  1. Direct
  2. Indirect
  3. Semi-direct
  4. Semi-indirect
  5. Diffused
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5
Q

The percentage of total lumen emitted by the luminaires compared to total lumens generated by the lamp alone.

A

Luminaire efficiency

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6
Q

The percentage of the initial lamp lumens that reach the task area to produce illumination.

A

Coefficient of utilization

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7
Q

The selection of luminaires is usually made based on:

A

Luminaire efficiency and Coefficient of utilization

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8
Q

The choice of the light source for luminaires is:

A
  1. Incadescent
  2. Fluorescent
  3. high intensity discharge (HID)
  4. low-pressure sodium (LPS)
  5. LED
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9
Q

The two of the main causes of light loss up to 50% with time are:

A
  1. Lamp Lume depreciation
  2. Luminaire Dirt Depreciation
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10
Q

The accumulation of dirt on lamps and fixtures can cause light losses of 30% or more

A

Luminaire Dirt Depreciation

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11
Q

Who invented and patented the incandescent bulb?

A

Joseph Swan

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12
Q

What are the advantage of incandescent bulbs?

A
  • Affordable
  • Compact
  • produce light with warm color tone
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13
Q

The higher the efficacy, the ________ the life expectancy

A

lower

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14
Q

The higher the operating temperature of the filament, the ______ the light output, but the _______ the life span of the lamp

A

Higher, shorter

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15
Q

Quartz glass is used with tungsten-halogen lamps because…….

A

it can withstand very high temperatures.

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16
Q

The size and shape of a bulb is designated by a

A

Code

17
Q

T-10 indicates a tubular bulb having a diameter of

A

11/4”

18
Q

G-57 indicates a globular bulb having a diameter of 57

A

71/8”

19
Q

The three glass used for bulb lamps may be:

A

Clear, Diffuse, or Colored.

20
Q

_________ reduces the brightness of the light source by
effectively increasing the surface area of the bulb.

A

Diffuse glass

21
Q

__________ bulbs are used to produce different colors of light.

A

Colored glass

22
Q

_________ is ideal where good optical control is required as in
overhead projectors or spotlights

A

Clear glass

23
Q

Bulbs of 300 W or above are available with _______ bases

A

Mogul

24
Q

The most commonly used base for a general service lamp is the ________.

A

Edison base

25
Q

Typical sizes of lamp bases are:

A

mogul, medium, intermediate and candelabra

26
Q

The ________ base, which accommodates lamps from 7.5 W up to and including 300 W, is the most common

A

medium

27
Q

Low-wattage indicator lamps and decorative lights use ________ or _________ bases.

A

candelabra, intermediate

28
Q

_________ are used for floodlighting where better heat radiation is possible.
These lamps generally have wattages of 500 W or more.

A

Biposts

29
Q

_________ lamps have a _________ efficacy (lumen output per watt) than low-wattage lamps of the same voltage

A

High-wattage, higher

30
Q

Three 50 W lamps produces more light than one 150 W lamp. True of False?

A

False. One 150 W lamp produces more light than three 50 W lamps

31
Q

High voltage lamps normally have a longer service life than 120 V lamps. True or False?

A

False. Low voltage lamps normally have a longer service life than 120 V lamps

32
Q

Higher filament temperatures produce greater efficacy but have a reduced service life. True or false?

A

True

33
Q

Over-voltage operation results in increased wattage, __________ output and_________.

A

More light, reduced life

34
Q

An operation has the opposite effect, producing decreased wattage, less light output and longer service life.

A

Under voltage

35
Q

he tungsten-halogen lamp is also called a

A

quartz-halogen lamp or quartz-iodine lamp.

36
Q

The four basic dimmer functions are:

A

-Adjustment
-Pre-Sets
-Remote / 3-Way
-Indicator Light

37
Q
A

Kevins Electrical Foundation (14 decks)

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