Week 6 Flashcards
what is light mainly composed of?
electromagnetic radiation
light travels in ___________?
waves
the following emr wavelengths are:
safe or dangerous
- radio
- microwaves
- IR
- visible
SAFE
the following emr wavelengths are:
safe or dangerous
- UV
- x ray
- gamma rays
DANGEROUS
what 5 things could occur when light waves encounter objects?
light waves can be ___________:
- reflected
- scattered
- absorbed
- pass through
- refracted
what is white light?
wavelengths mashed together :)
what occurs when all of the various wavelengths aren’t bent in an exact unified way
chromatic aberrations
The wavelength of light is from around _______to _________ nanometers.
400 to 700
how do we measure light?
footcandles
how much light is being reflected back into the meter?
reflective meter
how much light is hitting the surface of the meter
incident meter
whats does DISC stand for in regard to qualifying light?
D - direction
I - intensity
S - softness
C - colour
which of DISC is this referring to ?
where the light is coming from.
D - direction
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
I - intensity
which of DISC is this referring to ?
- hard shadow (well defined)
- soft shadow (less defined)
S - softness
which of DISC is this referring to ?
Also defined by the size of the light source relative to
the subject being illuminated
S - softness
which of DISC is this referring to ?
ultraviolet light is the strongest and warmest light
C - colour
what is this formula referring to?
“the intensity of the radiation is inversely proportional to the square of the distance”.
inverse square law
what is this deffinition referring to?
the difference between the minimum brightness and maximum brightness of a monitor
contrast ratio
what do we use a contrast ratio for?
to determine our doubling of light contrast ratio used in a scene or production
what is this formula referring to?
measured as a relationship between the KEY and FILL lights
contrast ratio
what do amps or amperage refer to in regards to power?
how much power is flowing
what do volts or voltage refer to in regards to power?
the pressure or intensity of which power is flowing
what do watts or wattage refer to in regards to power?
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
