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 manipulate 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 come 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 phrase specifically refers to a system positioned in ‘the gate’ or in the ‘point of focus’ in between the source of light and the lenses (or other optics). This placement is essential since it generates a crisp, sharp edged pattern or design (of logos, fine detail, architecture, etc.). Gobos placed after the optics usually do not create 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”. An alternative explanation is “graphical optical black out.” The term is traced to the 1930s, and originated in reference to your screen or sheet of sound-absorbent material for shielding a microphone from sounds originating from a specific direction, without application to optics. The treatment of the term as an acronym is recent and ignores the first definition in favour of popular invention. There are many online types of acoustic gobos. The word more than likely is a derivative of “goes between.”
A gobo light from the Earth, projected employing a halogen projector. Gobos are employed 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 produce moving shapes.Gobos could also be used for architectural lighting, plus in interior decorating, as in projecting a business logo over a wall.
Gobos are created from various materials. Common types include steel, glass, and plastic. Steel gobos or metal gobos make use of a metal template that the picture is cut out. These are the basic most sturdy, but often require modifications to the original design-called bridging-to display correctly. To correctly represent the letter “O” as an example, requires small tabs or bridges to back up the opaque center from the letter. These may be visible within the projected image, which might 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 inside the projected image. This eliminates any necessity 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 each color) glued with an aluminium or chrome coated monochrome gobo, or by newer technologies that vary the thickness of the dichroic coating (and for that reason the color) in a controlled way on one piece of glass-which assists you to turn one photo in to a glass gobo. Glass gobos generally offer the highest image fidelity, but they are probably the most fragile. Glass gobos are usually created with laser ablation or photo etching.
Plastic gobos or Transparency gobos may be used in LED ellipsoidal spotlights. These “LED Only” plastic gobos may be full color (just like a glass gobo), however are far less delicate. They are new to the marketplace, as are LED lights, as well as their durability and effectiveness vary between brands.
In the past, plastic gobos were generally tailor made for when a pattern requires color and glass will not suffice. However, in a “traditional” (tungston-halogen) light fixture, the focus point position of the gobo is extremely hot, so these thin plastic films require special cooling elements to prevent melting. A lapse in 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. Additionally they can produce custom gobos from customer artwork. Generally, a lighting designer chooses a pattern from a manufacturer’s catalog. Due to the large number of gobos available, they can be 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 tend to be found in weddings and corporate events. They could project company logos, the couple’s names, or just about any artwork. Some companies can make gobo within per week. Designers rxziif use “stock” gobo patterns for these events-as an example for projecting stars or leaves on the ceiling.
The word “gobo” also is utilized to describe black panels of numerous 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 from the existing light. It is the complete opposite of a photographer using a “reflector” to redirect light right into a shadow, that is “additive” lighting and many frequently used. Usage of a gobo subtracts light from the percentage of a general shaded subject and helps to create 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 between the sharp subject and unsharp background, called bokeh.