Midterm Study Guide
Midterm Study Guide TH 2190 - 01
Popular in Stage Lighting I
Popular in Theatre
This 6 page Study Guide was uploaded by Lydia Patchett on Friday October 14, 2016. The Study Guide belongs to TH 2190 - 01 at Wright State University taught by Matthew P. Benjamin in Fall 2016. Since its upload, it has received 7 views. For similar materials see Stage Lighting I in Theatre at Wright State University.
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Date Created: 10/14/16
Lydia Patchett Name and define the functions of light 1. Mood 2. Selective visibility 3. Understand the levelof reality 4. Understand where we are 5. Visibility 6. Revelation of form/ 3 dimensionality/ modeling 7. Composition – visual equivalent of a painting 8. Rhythm – visual equivalent of music Name and define the qualities of light 1. Intensity 2. Color 3. Direction 4. Texture/ pattern (often falls under movement) 5. Movement (physical and perceived) Name the Parts of a light based on a picture Page 1 of 6 Lydia Patchett Master ElectricianDuties and Responsibilities 1. They create the paperwork a. Instrument schedule b. Channel Hookup c. Dimmer Hookup 2. They need to know all the details of the space 3. What fixtures are available 4. How many circuits and dimmers are there? 5. Is there a lighting console/ what is it? 6. Are there positions to hang lights FOH? 7. Is there a genie? 8. You never want to trust the tech specs if you can check for yourself (especiallyfor tours) 9. They are the one in charge of sorting the duties of their crew 10. They oversee the budget 11. They need to have the ground plan a. This willhelp them know what fixtures they willneed to use b. This willalso show them how much space they have c. This willtell them about their accessibility(how they willget to the lights) 12. They need to have a good understanding of how long it takes to do something Basic Electricity Atomic Theory o Protons: positive charge o Electrons: negative charge o Electricity and magnetism go hand inhand (movement of electrons from the poles create electricity) Basic Circuit Series Circuitry: BAD Page 2 of 6 Lydia Patchett ParallelCircuitry: GOOD Bad Conductors/ Good Insulators Good Conductors/ Bad Insulators Plastic Rubber Water Silver Fiberglass Asbestos Copper Aluminum Ceramics Air Gold Brass Wood Electromagnetism o Generators o Transformers o A/C vs. D/C o In directcurrent (DC), the electric charge (current) only flows in one direction o Electric charge in alternating current (AC) changes directionperiodically AC is used to deliver power to houses, office buildings, etc., as it is often chosen as the primary means to transmit electricityover long distances Circuit Protection o Circuit breakers o Fuses Power Formula (West Virginia) Watts = Voltage x Ampere o Can also be written as Power = Intensity x Energy o Wattage – the amount of worka circuit is capable of doing o Voltage – potential energy (similar to water pressure) A US outlet has 110 to 120 Volts Theatrical outlets have 120v and 280v o Amperage – Rate of flow aka speedof electrons (flow rate) o Ohms – resistance Water Flow ElectricityFlow Gallons/ hour (flow rate) Amps (current) PSI (water pressure) Volts Page 3 of 6 Lydia Patchett Resistance to flow Ohms (resistance) Ohms Law - Safety Resistance Reflectors Lenses Lamps Lighting Instruments Ellipsoidals o Ellipsoidalreflector spotlight o ETC is the most common brand o These can have different field angles (19*, 26*, 36*, and 50* are the most common) Fresnels o Very soft/ diffused light o Spherical reflector o Spot: the lamp is at the back of the light (about 10% gets through) o Flood: the lamp is at the front of the light (about 60% gets through) o This can have a gel frame, a top hat, or barn doors Par Cans o No lens at the front of the light o Sealed beam lights o No moving parts o The only thing that can go wrong is the lamp/ lens/ reflector (they can be rotated) o The lamps are oval shaped VNSP – very narrow spot lens (clearglass) NSP – narrow spot lens (stippledglass) MFL – medium flood lens (8 rows across) Page 4 of 6 Lydia Patchett WFL – wide flood lens (12 rows across) XWFL – extra wideflood lens (???) o This can have a gel frame, a top hat, or barn doors Scoops o Ellipsoidalreflector o Used as work lights o This was once used to light a show, but is no longer Cyc or Strip Lights o Designed for lighting drops o Broken up into multiple circuits (3) There willbe three pigtails to match o Cyc lights – most are arranged into a 2 x 2 square with four colors o Strip lights use a symmetrical reflector o Cyc lights use an asymmetrical reflector – this spreads the light down and canbe put closerto the drop Cable and Conductors In electronics, a cable can mean a more or group of wires bundled together with insulation. Each wirecan have a wireconductor in it. Conductor on the other hand alsohas many meanings. In electronics, it is a material that can conduct electricity. Usually metal. soa hunk of aluminum is a conductor, has nothing to do with a cable. Wire Gauge and Ratings 18 gauge: 3A 16 gauge: 6A 14 gauge: 15A 12 gauge: 20A 10 gauge: 25A 8 gauge: 35A 6 gauge: 50A Drafting Conventions Light Plots The light plot is a plan view of the stage showing where each lighting instrument is located. The instrument type (Ellipsoidal,Fresnel,Scoop, etc...) is represented by a symbol. Each light is identified by a unit number placed within the symbol. Depending on the designer, the color, purpose (or focus), circuit (or dimmer) and control channel for each unit may also be listed on the plot. Lighting Paperwork Channel Hookups – data is arranged in order,by channels Instrument Schedule – the data is arranged inorder of hanging position Dimmer Schedule – Arranged in order by dimmer Page 5 of 6 Lydia Patchett Magic Sheets – Sometimes referredto as a cheat sheet - quick reference, usually only one or two pages long, giving the lighting designer quick visual access,sorted by purpose, to each channel and the fixture(s) it controls. Cheat Sheets - Cardboards – this is a small part of a piece of paperworkthat is pasted on cardboardand then given to the crew to hang and focus lights Basic ETC Ion Programming Basic Lighting Design Process Page 6 of 6
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