Week 6 Flashcards by Anna Lannutti

Q

what is light mainly composed of?

A

electromagnetic radiation

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Q

light travels in ___________?

A

waves

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Q

the following emr wavelengths are:

safe or dangerous

radio
microwaves
IR
visible

A

SAFE

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Q

the following emr wavelengths are:

safe or dangerous

UV
x ray
gamma rays

A

DANGEROUS

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Q

what 5 things could occur when light waves encounter objects?

A

light waves can be ___________:

reflected
scattered
absorbed
pass through
refracted

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Q

what is white light?

A

wavelengths mashed together :)

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Q

what occurs when all of the various wavelengths aren’t bent in an exact unified way

A

chromatic aberrations

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Q

The wavelength of light is from around _______to _________ nanometers.

A

400 to 700

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Q

how do we measure light?

A

footcandles

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Q

how much light is being reflected back into the meter?

A

reflective meter

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Q

how much light is hitting the surface of the meter

A

incident meter

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Q

whats does DISC stand for in regard to qualifying light?

A

D - direction
I - intensity
S - softness
C - colour

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Q

which of DISC is this referring to ?

where the light is coming from.

A

D - direction

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Q

which of DISC is this referring to ?

Changes based on the proximity of the light to the
source
Relationship between source and ambient light level

A

I - intensity

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Q

which of DISC is this referring to ?

hard shadow (well defined)
soft shadow (less defined)

A

S - softness

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Q

which of DISC is this referring to ?

Also defined by the size of the light source relative to
the subject being illuminated

A

S - softness

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Q

which of DISC is this referring to ?

ultraviolet light is the strongest and warmest light

Study These Flashcards

A

C - colour

Q

what is this formula referring to?

“the intensity of the radiation is inversely proportional to the square of the distance”.

Study These Flashcards

A

inverse square law

Q

what is this deffinition referring to?

the difference between the minimum brightness and maximum brightness of a monitor

Study These Flashcards

A

contrast ratio

Q

what do we use a contrast ratio for?

Study These Flashcards

A

to determine our doubling of light contrast ratio used in a scene or production

Q

what is this formula referring to?

measured as a relationship between the KEY and FILL lights

Study These Flashcards

A

contrast ratio

Q

what do amps or amperage refer to in regards to power?

Study These Flashcards

A

how much power is flowing

Q

what do volts or voltage refer to in regards to power?

Study These Flashcards

A

the pressure or intensity of which power is flowing

Q

what do watts or wattage refer to in regards to power?

Study These Flashcards

A

energy created or required

how much does 1 amp power ( in watts)?

1 amp = 100 w

what type of light is this description referring to? - black body radiators - draw very high energy compared to output - gets very hot - effects colour temperature

TUNGSTEN (street lights, lamp lights, lightbulb)

what type of light is this description referring to? - gas mixture ignited by ballast - different coloured temperature - draw low energy compared to output - out put a softer light - non dimmable

FLUORESCENT (lightbulbs)

what type of light is this description referring to? - hydrargydum medium arc lodide - gas mixture ignited by ballast - daylight colour temp -5400 K - emit UV light

HMI (film industry)

what type of light is this description referring to? - light emitting diodes - range of CT and colours - very low energy draw compared to output - many small point sources - often dimmable - very low voltage (safe to experiment)

LED LIGHTS (bedroom lights)

describe flood lighting direction?

light emits in angled directions

describe spot lighting direction?

light emits like 2 parallel lines in the same direction

what are barn doors used for?

used to control the area of illumination

what are strip or cyc lights used for

designed to cast light down or up cyc walls

what kind of light is this describing? - very soft, hard to control, barn doors have no effect

broadlights

what are pattern projectors used for?

create patterned lights! goes between optics

bouncer/reflectors question what does a full surface black reflector aim to do?

block light and add shadows and depth

bouncer/reflectors question what does a full surface white reflector aim to do?

soften artificial lights

bouncer/reflectors question what does a full surface silver reflector aim to do?

add contrast to sharp highlights and reflect natural or artificial light

bouncer/reflectors question what does a full surface sunlight reflector aim to do?

add warmth and subtle contrast by reflecting natural or artificial light

what kind of lighting is being described here? - controlled via a lighting board or app that allows you to adjust from the ground - often used in studios, live stage events

DMX controlled lighting