stage Lighting Final Flashcards
Center Line
- Divides the Proscenium Arch and Performance Space in Half
- Runs perpendicular to the Proscenium Arch
- Written as ‘CL’
Plaster Line
Runs along the US Edge of the Proscenium Arch
- Seperates Stage from House (but most stages extend beyond Plaster Line)
- written as ‘PL’
Zero-Zero
-Intersection of CL and PL
-Bases for all measurements in the theatre
-imagine an X and Y axis grid. This is the Origin Point
Some call this Center-Center. Others not so much
electricity
a form of energy characterized by the pressemce and mortion of elementary charged particles generated by friction, induction, or chemical change and having magnetic and radiant effects
light
a form of radiant energy that stimulates visual perception
Power Formula
W=VA (Watts equals Volts times Amps)
Also could be V=W/A or A=W/V
using alternative symbols: P=IE (W=AV)
p=power, I=intensity, E=electromotive force
most commonly used for formula for our work
Ohm’s Law
V=IR (volts equals mps times Ohms)
As voltage increases, current increases. As resistance increases, current decreases.
Also could be: I=V/R or R=V/I
parts of an electrical system
source, circuit, load
complete circuit
for a circuit to be closed and for current to flow, the circuit must connect from the source to both sides of the load
Parallel Circuit
each load recieves full voltage
circuit is still closed if one lamp is out
series circuit
all loads share full voltage
circuit is open if one lamp is out
combination circuit
looks like a parallel circuit
includes a switch and a fuse/circuit breaker
voltage
volt, V or E
the potential to push or pull the electrons away from their binding atoms. A difference in electrical potential
Current
Amp, A or I
the measure of the flow of electrical charges. What we understand as electricity
resistance
Ohm, R or Omega
the oppostition to the flow of electrical current
power
wass, W or P
the measure of the rate at which work is being done
proscenium
audience completely seperate from stage, very traditional style, 4th wall (like a movie camera), proscenium Arch
thrust
stage protrudes into audience, more intimate style, audience on 3 sides of stage, still has a stage house, but isn’t used for much action
Arena/Round
audience surrounds stage, very intimate style, will be looking at some performer’s backs some of the time
flexible/blackbox
various possible seaying arrangments, sometimes old buildings repurposed into theatres
Arena/Runway
audience on two sides of a wide and shallow stage
environmental/found space
loose interpretation of theatre space, sometimes audience and performers occupy the same space
leg
vertical piece of masking that keeps audience from seeing into wing SL or SR
also called tormenter
tab is a leg that us hung US/DS
border
horiz piece of masking that keeps audience from seeing the grid or into the flys
also called teaser
Valance
Most DS Border
usually elaborately decorated or same color as main curtain
house curtain
main curtain, just US of proscenium
keeps audience from seeing scenery before show starts
can be used to mask scene changes
also called main rag
backdrop
keeps audience from seeing the back wall of theatre
can be painted to represent scenery, sky, etc
cyclorama=backdrop that is not painted, or is painted whit/light blue
aslo called cyc
in 1, in 2, etc
combination of leg, border, and sometimes tab
makes a SL/SR alley
scenes are sometimes played in 1, with a scene change happening behind
Single phase Color Wiring
Hot-Black
Neutral- White
Ground- Green
Hot serves as circuit for current flow, neutral serves as circuit for current return. ground serves as safety valve in case of short circuit. in alternating current, hot and neutral switch roles as polarity switches
three phase wiring
hot 1-black hot 2- red hot 3-blue neutral-white/gray ground-green, green/yellow
three hot wires, or phases, share a common neutral
parts of a lamp
bulb, filament, base
insulators
rubber, glass, wood, dry air
conductors
silver, gold, copper, aluminum, iron, mercury, carbon, water
Stepladders
- One side can be walked on and one side is not supposed to be walked on
- Not supposed to walk on top set or second to the top
Extension Ladder
- Two sections
- One sided
- Meant to be leaned against a wall
- Base section and fly section
Trestle ladder or A-Frame ladder
- Free standing ladder but middle ladder can be lifted up, A frame
- Same idea as the extension ladder but doesn’t need to be leaned against a wall
Extension Trestle ladder
- Two trestle ladeers with a lader inbetween
* Scaffold in between, or plank across, more space
Scaffolding
- Walk board
- Not too high
- Work service
Personal Lift
- “genie lift” name brand
- automated
- basket to hold one person
- someone has to push you t move and not safe to move if someone is in it
Scissor lift
- Like “genie lift” but has a walk board lift like the scaffold
- Driveable, forward, backword
- Driveable from up high
Focus Track with Bosun’s Chair
• Person can travel all the way across to focus lights and not need to move a ladder to get to all the lights
• Four way screw driver
o Plus sign-phillips tip o Slotted (minus signe) Not called flat head
• Insulated screwdriver
o Allows you from being shocked when working with a live load
• Mini/Precision Drivers
o Eye glass screwdrivers o Delicate work o Benefit-spinning back side • Resting in palm of hand and can turn it using your fingers • Come in slotted and Phillips heads
o Allen Wrenches
• Six sided wrench (Hexagonal)
• Tape measure
o Measure distances
o Can tie off to belt
o Scale rule
- Helps measure scaled down drawings
* Helps you read it in different scales
o Flat tape
• Longer distances
o Sharpies and highlighters
• Helps to mark and highlight light plot- paperwork
o Silver Sharpie
• Cant write with black sharpie so you can use silver
• LED flashlight
o Sturdy
o Don’t break if you drop it
• Headlamp
o Hands free
• Multi Meter
o These can be used to measure continuity, measuring resistance and if there is a complete circuit
o Can also measure voltage coming out of a wall
o Touch with one of the ends
• Clamp Meter
o Clamp opens when press a button, and allows you to clamp around it, don’t have to touch it
o Measures the electro magnetic field
o Tells you how much current is going through
o Can see if current is flowing
• Circuit Tester
o Chirps and has a light to tell you if there is hot power
o Tells you when there is juice
• Electrical Tape
o Plastic tape o Tear able o Pliable and flexible o Comes in different colors o Use it for color coding
• Gaffer’s Tape
o Fabric tape, woven fabric
o Tears on a grain
o Strong tape
o Tape wires down, used for safety, lots of purposes
o 2 inch is most common size but comes in diff sizes
o different colors
o Gaffer- a person who does all the wiring and electrical stuff in movies
o Doesn’t leave sticky residue
• Spike Tape
o Marking on a stage
o Thin roll of gaf tape
o Many colors
• Glow Tape
o Plastic tape
o Glows
o Used for spiking things that are in the dark
• Blackwrap
o Black aluminum foil
o Used by electricians where a lot of light is bleeding out of it
o Can take high heat
o Can wrap around to change the way the light is pointing
o Used to manipulate light
• Blacktak
o Like blackwrap but its sticky on one side
o Foil that’s adhesive on one side
o Used to stick to the light
law of reflection
angle of reflection=angle of incidence
types of theatrical reflectors
spherical- half circle
parabolic- crescent moon
ellipsoidal- half oval
refraction
light goes at an angle, then where the glass is it refracts the beam, or make the steepness a little less, then the light travels at the same steepness but does not match directly up with the original place of beam, but same steepness
basic lens shaped
convex-football shaped
concave-hour glass
plano convex-half circle
light passing through a plano-convex lens
source, A B C D-focal length in fourth lens, convergence point, even spread out
light passing through theatrical lenses
focal length- two lenses close facing in towards each other, focal length is line between two. then point of convergence at end
step+Fresnel Lens
!
reflection vs. Refraction
refection- The act of reflecting or the state of being reflected.Something, such as light, radiant heat, sound, or an image, that is reflected.
refraction-The turning or bending of any wave, such as a light or sound wave, when it passes from one medium into another of different optical density.
lighthouse fresnel light
fresnel lens makes it so that the light shoot straight out completely from one end to the other
light path in an ellipsoidal reflector spotlight
primary focal point (first point where te light comes together), shutters, gobo, secondary focal point (second point where all the light comes together) axis (dotted line through the picture horiz)
plug
male end, has conductors protruding from plug
receptacle
female end, conductors are not exposed
wire
length of insulated copper
“pins to power”
illustrates that plug ends always points toward the source of voltage. works the same as data cables (sound, DMX)
dangerous to have double pug cable
pointless to have double receptacle cable
cable direction
“pins to power”, dangerous to have double-plug cable, pointless to have double-receptacle cable
stage pin
theatrical standard, 2Pins plus Ground
Neutral and ground pin close together, hot pin farther away
edison
common, household style in USA
ground-half circle hole
Hot- shorter rectangle hole
Neutral- longer rectangle hole
twistlock
older theatrical style
ground- half circle with rectangle pointed in, diff looking
neutral- thinner and shorter
hot- thicker and longer
jumper
extension cord
multi-cable
bundled cables are easier to run and maintain
sometimes called ‘mult’ or ‘socapex’ or ‘soco’
break=in vs. break-out
feeder
typically CamLock, used to connect dimmers to AC Service
heavy duty, thick copper, three phase power
two-fer
or three-fer, different ends
can plug two loads into one source
rheostat dimmer
wall switch/dimmer
mechanical dimming
inefficient because of heat loss
silicon controlled rectifier dimmer
the cards we pulled out in class in blackbox
DMX
Digital Multiplex
- Speaks to dimmers, 5 pins means its for lighting,
- looks like microphone but that has three pins,can transmit 512 bits of data
- 512 dimmers can be controlled at any given time, each dimmer takes one channel, moving lights take thirty bits of data, light board is source, pins go toward the console, set dimmer levels, and recording them in certain times, recordable console, lighting consoles have sliders
CamLock
used on feeder cable- colored wires
adaptor
goes from one style to another
dimmers
regulates the voltage applies to a lamp thereby regulating the current supplied. And with less current, less work can be done
voltage can be regulated manually or electronically
modern dimmers are scr style (silicon controlled rectifier
SCR dimmers switch on and off at a variable rate therefore regulating the voltage
more efficient than old style dimmers, which absorb part of the voltage, converting it to heat
rheostat
wall switch/dimmer
mechanical dimming
inefficient because of heat loss
silicon controlled rectifier dimmer
the thing we pulled out in class, looks like DJ booth
Standing end- the long end
- the part not knotted. That standing part lies between the standing end and the knot
- Part not working with
- Part not knotted
Tail-short end
- Part that gets knotted
- Running end
- Working end