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production theory 2 > week 7 > Flashcards

week 7 Flashcards

1
Q

Three properties of light

A

Wavelength
frequency
intensity

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2
Q

Light has both blank and blank properties

A

Electric and magnetic

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3
Q

light travels in ____

A

waves

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4
Q

What is the difference between light waves and audio or ocean waves

A

light waves move in different direction

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5
Q

What are four types of EMR wavelength that are safe

A

Radio, microwaves, IR, visible

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6
Q

What are three dangerous EMR waves

A

UV, x-ray, gamma

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7
Q

when light waves encounter objects what four things can they do

A

Reflect, absorb, pass through, refract

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8
Q

When light waves in counter objects what happens

A

Multiple colours of light encounter objects and appear as white light

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9
Q

White light is made up of a whole bunch of different___

A

Wavelengths of light

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10
Q

What is chromatic aberration

A

When all the various wavelengths aren’t bent exactly the same

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11
Q

What do we call it when various wavelengths are not bent exactly the same

A

Chromatic aberration

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12
Q

What is the wavelength of light in nanometers

A

From 400 to 700 nanometers

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13
Q

The frequency of visible light is called what

A

Colour

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14
Q

What is the range of visible light/color in hertz (Hz)

A

430 trillion hertz to 750 trillion hertz

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15
Q

What colour can be seen at 430, trillion Hz

A

red

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16
Q

What colour can be seen at 750 trillion Hz

A

violet

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17
Q

what are footcandles

A

1 foot candle is the amount of light on a 1 inch square surface

Created from a source of light that is 1 foot away from the source

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18
Q

How many foot candles is full unobstructed sunlight

A

10,000 foot candles

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19
Q

How many foot candles are cloudy days

A

Around 100 foot candles

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20
Q

What is Lux

A

Lux is the amount of light being generated at a defined distance

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21
Q

What is the formula for converting lux to foot candles

A

10.76 Lux = 1 foot candle

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22
Q

What are two ways to measure light

A

Lux and foot candles

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23
Q

What are two tools used to measure light

A

Reflective meter

and incident meter

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24
Q

What is a reflective metre

A

Measures how much light as being reflected back into the metre

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25
Q

What is an incident metre

A

How much light is hitting the surface of the metre

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26
Q

What is the acronym for qualifying light

A

D
I
S
C

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27
Q

What does disc stand for

A

Direction, intensity, softness, colour

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28
Q

How do I tell which direction the light is coming from

A

Observed through the shadow

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29
Q

How do you define intensity of light

A

Relationship between source and ambient light level

It changes based on the proximity of the light to the source

If one light exhibit more intensity than others this is understood through an increase in perceived contrast

30
Q

How is softness defined

A

By the shadow the light creates

By the size of the light source relative to the subject being illuminated

31
Q

What is a hard shadow versus a soft shadow

A

A hard shadow is a well defined

a soft shadow lesser defined edges

32
Q

How is the colour of a light measured

A

Degrees kelvin

33
Q

What are 4 degrees kelvin colours to know

A

Tungsten halogen
Household fluorescent
Noon sunlight
LCD monitor

34
Q

From yellow to blue which order do the 4 kelvin colours go in

A

yellowest: tungsten

blue-whiteish: household fluorescent

pale blue: noon sunlight

bluest: LCD monitor

35
Q

What are contrast ratio’s

A

Relationship between the key light and fill light

36
Q

How are contrast ratio is measured

A

The doubling of light

37
Q

What is fill light

A

How many times brighter

38
Q

Three elements of power

A

Amperage
Voltage
Wattage

39
Q

What is amperage/amps

A

How much power is flowing

40
Q

What is voltage/volts

A

The pressure/intensity at which the power is flowing

41
Q

What is wattage/watts

A

Energy created or energy required

42
Q

How many amps is the average circuit

A

15 amps

43
Q

One amp Powers how many watts

A

1 amp powers 100 Watts

44
Q

What are four elements of tungsten lights

A

They have black body radiators

They draw high energy

They get hot around 3200 Kelvin

They are dimmable

45
Q

What are five properties of fluorescent lights

A

gas mixture ignited and controlled by ballast

Different colour temperatures

They draw low energy

The output softer light

They are non-dimmable

46
Q

Five properties of HMI lights

A
  • hydrargydum
  • Gas mixture ignited and controlled by a ballast
  • Daylight colour temperature
  • Draws low energy
  • emits UV light
47
Q

What are five properties of LED lights

A

Light emitting diode’s

Range of temperature and colours

Very low energy

Many small point sources

Often dimmable

48
Q

Which two types of light have a gas mixture ignited and controlled by ballast

A

HMI and fluorescent

49
Q

Which lights get very hot

A

Tungsten

50
Q

Which lights are non-dimmable

A

Fluorescent

51
Q

Which three lights dry low energy

A

Fluorescent HMI and LED

52
Q

Which type of light draws the lowest energy

A

LED lights

53
Q

What are two light locations of Frenzel

A

Flood and spot

54
Q

What is the difference between Flood in Spot in a Fresnel light

A

Flood is when the lightbulb is close to the lens

Spot is when the lightbulb is far away from the lens

55
Q

What is the wattage range of a frensel light

A

100 W to 50,000 W

56
Q

What are barn doors

A

Used to control the area of illumination

57
Q

What will narrowing the barn doors do

A

Result in a narrower shaft of light

58
Q

What are three elements of a broad light

A

Very soft
Hard to control
Barn doors have no effect

59
Q

what is an ellipsoidal also known as

A

A pattern projector

60
Q

What are cyc or strip lights

A

Designed to cast light down or up cyclorama walls

61
Q

What will black bouncers or reflectors do

A

Add depth and shadows

Block unwanted light and reflections

62
Q

What will white bouncers and reflectors do

A

Soften and reflect light

Will not change the colour temperature

63
Q

What will silver bouncers and reflectors do

A

Reflect light

Add contrast or sharp highlights

64
Q

What will gold bouncers and reflectors do

A

Add a hint of warmth

Subtle contrast by reflecting light

65
Q

What are three lighting modifiers

A

Silk
flag
net

66
Q

What will silk light modifiers do

A

Defuse and soften light

67
Q

What will flag modifiers do

A

Block/cut light

68
Q

What will NET modifiers do

A

Reduce intensity

69
Q

What does DMX stand for

A

Digital Multiplex

70
Q

What do you DMX digital multiplex lights do

A

Controlled via a lighting board or an app

Allows you to adjust lighting from the ground

production theory 2 (4 decks)

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