A gobo light is a stencil or template placed inside or in front of a light source to regulate the shape of the emitted light. Lighting designers typically utilize them with stage lighting instruments to manage the shape of the light cast over a space or object-for instance to generate a pattern of leaves on the stage floor. Sources
The term “gobo” has come to sometimes reference any device that produces patterns of light and shadow, as well as other items which go before a mild (for instance a gobo arm or gobo head). In theatrical lighting, however, the phrase more specifically refers to a device placed in ‘the gate’ or on the ‘point of focus’ between the source of light and the lenses (or other optics). This placement is very important since it generates a crisp, sharp edged pattern or design (of logos, fine detail, architecture, etc.). Gobos placed following the optics tend not to produce a finely focused image, and are more precisely called “flags” or “cucoloris” (“cookies”).
he exact derivation of gobo is unclear. It is actually cited by some lighting professionals as “goes before optics” or, more infrequently, “goes between optics”. A different explanation is “graphical optical black out.” The term is traced back to the 1930s, and originated in reference to a screen or sheet of sound-absorbent material for shielding a microphone from sounds originating from a certain direction, with no application to optics. The treatment of the phrase being an acronym is recent and ignores the first definition in support of popular invention. There are lots of online examples of acoustic gobos. The phrase probably is a derivative of “goes between.”
A gobo light from the Earth, projected utilizing a halogen projector. Gobos are used with projectors and simpler light sources to generate 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 could also be used for architectural lighting, plus in interior design, as with projecting an organization logo over a wall.
Gobos are made of various materials. Common types include steel, glass, and plastic. Steel gobos or metal gobos make use of a metal template from which the picture is eliminate. These are the basic most sturdy, but often require modifications towards the original design-called bridging-to show correctly. To correctly represent the letter “O” for instance, requires small tabs or bridges to support the opaque center from the letter. These may be visible within the projected image, which can be undesirable in a few applications.
Glass gobos are produced from clear glass with a partial mirror coating to block the sunshine and provide “black” areas in the projected image. This eliminates any necessity for bridging and accommodates more intricate images. Glass gobos may also include colored areas (just like stained glass windows), whether by multiple layers of dichroic glass (one for each and every color) glued on an aluminium or chrome coated monochrome gobo, or by newer technologies that vary the thickness in the dichroic coating (and thus colour) in a controlled way on one part of glass-which makes it possible to turn one photo into a glass gobo. Glass gobos generally offer the highest image fidelity, but are by far the most fragile. Glass gobos are generally designed with laser ablation or photo etching.
Plastic gobos or Transparency gobos can be utilized in LED ellipsoidal spotlights. These “LED Only” plastic gobos can be full color (just like a glass gobo), but are less delicate. They are a new comer to the market, as are Leds, along with their durability and effectiveness vary between brands.
Previously, plastic gobos were generally custom made for when a pattern requires color and glass fails to suffice. However, in a “traditional” (tungston-halogen) light fixture, the focus point position of the gobo is very hot, so these thin plastic films require special cooling elements to prevent melting. A lapse in the cooling apparatus, for seconds, can ruin a plastic a gobo in a tungsten-halogen lighting instrument.
Patterns – Theatrical and photographic supply companies manufacture many simple and complex stock patterns. They also can produce custom gobos from customer artwork. Generally, a lighting designer chooses a pattern coming from a manufacturer’s catalog. As a result of great number of gobos available, they are often known as by number, not name. Lighting technicians can also hand cut custom gobos away from sheet metal stock, or perhaps aluminum pie tins.
Gobos are frequently used in weddings and corporate events. They can project company logos, the couple’s names, or just about any artwork. Some companies can make glass gobo in as little as every week. Designers rxziif use “stock” gobo patterns for these events-for instance for projecting stars or leaves onto the ceiling.
The phrase “gobo” is also utilized to describe black panels of different sizes or shapes placed from a source of light and photographic subject (including between sun light and a portrait model) to control the modeling effect of the existing light. It will be the opposite of a photographer using a “reflector” to redirect light in to a shadow, which can be “additive” lighting and many widely used. Utilization of a gobo subtracts light from the part of a general shaded subject and creates a contrast between one side from the face and the other. It allows the photographer to expose with wider open apertures giving soft natural transitions involving the sharp subject and unsharp background, called bokeh.