By Craig Leerman • July 14, 2013 Arc Lamp: A bulb that produces light by an arc created between two electrodes inside a glass envelope that contains a gas. Aspect Ratio: The width of a picture or projection screen in relation to its height, usually expressed in a “width x height” manner, i.e., 4×3 or 4:3. Audience Blinders (a.k.a. Molefays): A fixture that contains multiple bulbs (usually PARs) that is pointed at the audience and bumped for accents or used to illuminate the crowd. Barn Doors: A unit that is mounted at the front of a lighting fixture with adjustable doors that shapes the beam and helps control spill. Barrel: The part of an ellipsoidal fixture that contains the lenses. Batten: Metal pipes suspended in rows above a stage, used for the rigging of lighting and scenery. Black Burst: A blank video signal that synchronizes video sources so they’re moving in step from one frame to the next. Bump: A quick level change in lighting, usually to full. Coffin Locks (a.k.a. Roto-Lock): A mortised connector used to couple stage platforms or scenic items together. Color Temperature: The measurement in degrees on the Kelvin scale indicating the hue of a specific type of light source. Component Video: An analog video signal using three conductors, one each for luminance (with sync and green reference), blue minus luminance and red minus luminance. Composite Video: A single-channel analog video signal carrying all information. Cyc Light: A wash fixture normally used in multiples to light up a cyclorama, or now more commonly any backdrop. Cyclorama: A curved wall or curtain at the back (upstage) of a theater stage. Dichroic: A glass filter that allows a limited range of color to pass through a light fixture while reflecting the other colors in the spectrum. DMX512: The standard digital lighting protocol that can send 512 channels of control information to dimmers, automated lighting fixtures or special effects. Dress Kit: Drapery surrounding a portable projection screen, helping control spill light and giving a finished appearance. Ellipsoid Reflector Spotlight (a.k.a., Ellipsoidal, ERS, Profile or Leko): A spot stage lighting fixture with an ellipsoid shaped reflector that directs light through the barrel and lens, allowing focusing of the beam. Footcandle (fc): A unit of measurement of illumination – one footcandle equals one lumen per square foot. Gel: Common name for a color lighting filter. Genlock: Synchronization of the video signals of multiple devices to a single source, like a black burst generator. Gobo (a.k.a. Pattern): A glass or metal plate with a design etched or imprinted on its surface that can be projected when inserted into the pattern slot of an ERS type fixture. Intelligent Light (a.k.a. Intel or Automated Light): A lighting fixture that can be controlled from a console that can pan, tilt, color or shape the light beam. Read the rest of this post 1 2 About Craig Craig Leerman Senior Contributing Editor, ProSoundWeb & Live Sound International Craig has worked in a wide range of roles in professional audio for more than 30 years in a dynamic career that encompasses touring, theater, live televised broadcast events and even concerts at the White House. Currently he owns and operates Tech Works, a regional production company that focuses on corporate events based in Reno. http://techworksreno.com/ Comments Have something to say about this PSW content? Leave a comment! Cancel reply Scroll past the ”Post Comment” button below to view any existing comments. Your email address will not be published. Required fields are marked *Comment Name * Email * Website This site uses Akismet to reduce spam. Learn how your comment data is processed. Tagged with: Backline Craig Leerman Lighting Video · all topics Subscribe to Live Sound International Subscribe to Live Sound International magazine. Stay up-to-date, get the latest pro audio news, products and resources each month with Live Sound.