A gobo light is actually a stencil or template placed inside or in front of a light source to control 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-as an example to produce a pattern of leaves on a stage floor. Sources
The term “gobo” comes to sometimes reference any device that produces patterns of light and shadow, and other items that go before an easy (such as a gobo arm or gobo head). In theatrical lighting, however, the term specifically identifies a device positioned in ‘the gate’ or in the ‘point of focus’ involving the source of light as well as the lenses (or other optics). This placement is very important since it produces a crisp, sharp edged pattern or design (of logos, fine detail, architecture, etc.). Gobos placed right after the optics tend not to generate a finely focused image, and 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, more infrequently, “goes between optics”. A different explanation is “graphical optical black out.” The phrase is traced to the 1930s, and originated in reference to your screen or sheet of sound-absorbent material for shielding a microphone from sounds provided by a certain direction, without application to optics. The management of the term as an acronym is recent and ignores the original definition in favour of popular invention. There are many online samples of acoustic gobos. The term most likely is really a derivative of “goes between.”
A custom gobo of the Earth, projected employing a halogen projector. Gobos are utilized with projectors and simpler light sources to produce lighting scenes in theatrical applications. Simple gobos, incorporated into automated lighting systems, are popular at nightclubs and other musical venues to create moving shapes.Gobos may also be used for architectural lighting, as well as in interior decorating, like projecting a company logo on the wall.
Gobos are made from various materials. Common types include steel, glass, and plastic. Steel gobos or metal gobos utilize a metal template from where the picture is eliminate. These are the most sturdy, but often require modifications to the original design-called bridging-to present correctly. To correctly represent the letter “O” for instance, requires small tabs or bridges to back up the opaque center from the letter. These may be visible in the projected image, which can be undesirable in some applications.
Glass gobos are made of clear glass with a partial mirror coating to bar the sunshine 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 (just like stained glass windows), whether by multiple layers of dichroic glass (one for every color) glued on an aluminium or chrome coated white and black gobo, or by newer technologies that vary the thickness from the dichroic coating (and thus the colour) in a controlled way on one bit of glass-which makes it possible to turn a color photo in to a glass gobo. Glass gobos generally provide you with the highest image fidelity, but they are probably the most fragile. Glass gobos are usually designed with laser ablation or photo etching.
Plastic gobos or Transparency gobos may be used in LED ellipsoidal spotlights. These “LED Only” plastic gobos can be full color (just like a glass gobo), however are less delicate. These are a new comer to the current market, much like LED lights, along with their durability and effectiveness vary between brands.
Before, plastic gobos were generally tailor made when a pattern requires color and glass does not suffice. However, in a “traditional” (tungston-halogen) light fixture, the focus point position of any gobo is incredibly hot, so these thin plastic films require special cooling elements to stop melting. A lapse inside 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 easy and complex stock patterns. They also can produce custom gobos from customer artwork. Generally, a lighting designer chooses a pattern from the manufacturer’s catalog. As a result of multitude of gobos available, they are generally described by number, not name. Lighting technicians could also hand cut custom gobos away from sheet metal stock, or even aluminum pie tins.
Gobos tend to be found in weddings and corporate events. They are able to project company logos, the couple’s names, or almost any artwork. Some companies can change gobo within a week. Designers rxziif use “stock” gobo patterns for such events-as an example for projecting stars or leaves to the ceiling.
The term “gobo” is also used to describe black panels of different sizes or shapes placed from a source of light and photographic subject (such as between sun light and a portrait model) to control the modeling effect in the existing light. This is the complete opposite of a photographer using a “reflector” to redirect light in to a shadow, which can be “additive” lighting and most commonly used. Use of a gobo subtracts light from a percentage of a general shaded subject and produces a contrast between one side in the face and another. It allows the photographer to show with wider open apertures giving soft natural transitions between the sharp subject and unsharp background, called bokeh.