Week 6

Question 1

what is light mainly composed of?

Answer 1

electromagnetic radiation

Question 2

light travels in ___________?

Answer 2

waves

Question 3

the following emr wavelengths are:

safe or dangerous

• radio
• microwaves
• IR
• visible

Answer 3

SAFE

Question 4

the following emr wavelengths are:

safe or dangerous

• UV
• x ray
• gamma rays

Answer 4

DANGEROUS

Question 5

what 5 things could occur when light waves encounter objects?

Answer 5

light waves can be ___________:

• reflected
• scattered
• absorbed
• pass through
• refracted

Question 6

what is white light?

Answer 6

wavelengths mashed together :)

Question 7

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

Answer 7

chromatic aberrations

Question 8

The wavelength of light is from around _______to _________ nanometers.

Answer 8

400 to 700

Question 9

how do we measure light?

Answer 9

footcandles

Question 10

how much light is being reflected back into the meter?

Answer 10

reflective meter

Question 11

how much light is hitting the surface of the meter

Answer 11

incident meter

Question 12

whats does DISC stand for in regard to qualifying light?

Answer 12

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

Question 13

which of DISC is this referring to ?

where the light is coming from.

Answer 13

D - direction

Question 14

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

Answer 14

I - intensity

Question 15

which of DISC is this referring to ?

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

Answer 15

S - softness

Question 16

which of DISC is this referring to ?

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

Answer 16

S - softness

Question 17

which of DISC is this referring to ?

ultraviolet light is the strongest and warmest light

Answer 17

C - colour

Question 18

what is this formula referring to?

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

Answer 18

inverse square law

Question 19

what is this deffinition referring to?

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

Answer 19

contrast ratio

Question 20

what do we use a contrast ratio for?

Answer 20

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

Question 21

what is this formula referring to?

measured as a relationship between the KEY and FILL lights

Answer 21

contrast ratio

Question 22

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

Answer 22

how much power is flowing

Question 23

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

Answer 23

the pressure or intensity of which power is flowing

Question 24

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

Answer 24

energy created or required

Question 25

how much does 1 amp power ( in watts)?

Answer 25

1 amp = 100 w

Question 26

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

Answer 26

TUNGSTEN
(street lights, lamp lights, lightbulb)

Question 27

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

Answer 27

FLUORESCENT
(lightbulbs)

Question 28

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

Answer 28

HMI
(film industry)

Question 29

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)

Answer 29

LED LIGHTS
(bedroom lights)

Question 30

describe flood lighting direction?

Answer 30

light emits in angled directions

Question 31

describe spot lighting direction?

Answer 31

light emits like 2 parallel lines in the same direction

Question 32

what are barn doors used for?

Answer 32

used to control the area of illumination

Question 33

what are strip or cyc lights used for

Answer 33

designed to cast light down or up cyc walls

Question 34

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

Answer 34

broadlights

Question 35

what are pattern projectors used for?

Answer 35

create patterned lights! goes between optics

Question 36

bouncer/reflectors question

what does a full surface black reflector aim to do?

Answer 36

block light and add shadows and depth

Question 37

bouncer/reflectors question

what does a full surface white reflector aim to do?

Answer 37

soften artificial lights

Question 38

bouncer/reflectors question

what does a full surface silver reflector aim to do?

Answer 38

add contrast to sharp highlights and reflect natural or artificial light

Question 39

bouncer/reflectors question

what does a full surface sunlight reflector aim to do?

Answer 39

add warmth and subtle contrast by reflecting natural or artificial light

Question 40

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

Answer 40

DMX controlled lighting