A gobo light is actually a stencil or template placed inside or in front of a light source to regulate the shape of the emitted light. Lighting designers typically make use of them with stage lighting instruments to manage the shape of the light cast over a space or object-as an example to generate a pattern of leaves on a stage floor. Sources
The word “gobo” has arrived to sometimes refer to any device which produces patterns of light and shadow, as well as other items that go before an easy (like a gobo arm or gobo head). In theatrical lighting, however, the term more specifically describes a product positioned in ‘the gate’ or at the ‘point of focus’ involving the light source as well as the lenses (or some other optics). This placement is very important as it produces a crisp, sharp edged pattern or design (of logos, fine detail, architecture, etc.). Gobos placed right after the optics do not produce a finely focused image, and therefore are more precisely called “flags” or “cucoloris” (“cookies”).
he exact derivation of gobo is unclear. It really is cited by some lighting professionals as “goes before optics” or, less often, “goes between optics”. An alternate explanation is “graphical optical black out.” The phrase is traced returning to the 1930s, and originated in reference to your screen or sheet of sound-absorbent material for shielding a microphone from sounds coming from a specific direction, without application to optics. The treating of the term as being an acronym is recent and ignores the first definition in favor of popular invention. There are many online samples of acoustic gobos. The term more than likely is actually a derivative of “goes between.”
A gobo light in the Earth, projected using a halogen projector. Gobos are used with projectors and simpler light sources to create lighting scenes in theatrical applications. Simple gobos, included in automated lighting systems, are popular at nightclubs and other musical venues to create moving shapes.Gobos may also be used for architectural lighting, along with interior design, as in projecting a business logo over a wall.
Gobos are made of various materials. Common types include steel, glass, and plastic. Steel gobos or metal gobos use a metal template from where the photo is reduce. They are the most sturdy, but often require modifications towards the original design-called bridging-to show correctly. To correctly represent the letter “O” as an example, requires small tabs or bridges to aid the opaque center in the letter. These may be visible inside the projected image, which can be undesirable in certain applications.
Glass gobos are produced from clear glass having a partial mirror coating to block the light and provide “black” areas in the projected image. This eliminates any requirement for bridging and accommodates more intricate images. Glass gobos could also include colored areas (much like stained glass windows), whether by multiple layers of dichroic glass (one for every color) glued upon an aluminium or chrome coated black and white gobo, or by newer technologies that vary the thickness in the dichroic coating (and therefore colour) in a controlled way on one bit of glass-which assists you to turn a color photo right into a glass gobo. Glass gobos generally provide you with the highest image fidelity, however are probably the most fragile. Glass gobos are generally made with laser ablation or photo etching.
Plastic gobos or Transparency gobos can be utilized in LED ellipsoidal spotlights. These “LED Only” plastic gobos could be full color (like a glass gobo), but they are far less delicate. They may be new to the current market, as well as LED lights, as well as their durability and effectiveness vary between brands.
Before, plastic gobos were generally tailor made for when a pattern requires color and glass does not suffice. However, in a “traditional” (tungston-halogen) light fixture, the main focus point position of a gobo is incredibly hot, so these thin plastic films require special cooling elements to prevent melting. A lapse within the cooling apparatus, even for seconds, can ruin a plastic a gobo in a tungsten-halogen lighting instrument.
Patterns – Theatrical and photographic supply companies manufacture many basic and complex stock patterns. They also can produce custom gobos from customer artwork. Generally, a lighting designer chooses a pattern from a manufacturer’s catalog. As a result of great number of gobos available, they are often described by number, not name. Lighting technicians can also hand cut custom gobos from sheet metal stock, or even aluminum pie tins.
Gobos are frequently used in weddings and corporate events. They could project company logos, the couple’s names, or almost any artwork. Some companies can change gobo after as little as every week. Designers rxziif use “stock” gobo patterns for these events-for instance for projecting stars or leaves on the ceiling.
The phrase “gobo” also is utilized to describe black panels of different sizes or shapes placed from a source of light and photographic subject (like between sun light as well as a portrait model) to control the modeling effect in the existing light. It is the complete opposite of a photographer using a “reflector” to redirect light into a shadow, which can be “additive” lighting and a lot commonly used. Use of a gobo subtracts light from a percentage of a general shaded subject and creates a contrast between one side in the face and the other. It allows the photographer to show with wider open apertures giving soft natural transitions between the sharp subject and unsharp background, called bokeh.