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-for instance to produce a pattern of leaves on a stage floor. Sources
The phrase “gobo” has arrived to sometimes make reference to any device that produces patterns of light and shadow, and other pieces of equipment that go before a light (for instance a gobo arm or gobo head). In theatrical lighting, however, the phrase more specifically refers to a product positioned in ‘the gate’ or in the ‘point of focus’ involving the light source and also the lenses (or other optics). This placement is important because it produces a crisp, sharp edged pattern or design (of logos, fine detail, architecture, etc.). Gobos placed following the optics usually do not produce a finely focused image, and they 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”. An alternate explanation is “graphical optical black out.” The word is traced back to the 1930s, and originated in reference to some screen or sheet of sound-absorbent material for shielding a microphone from sounds coming from a specific direction, without any application to optics. The management of the term being an acronym is recent and ignores the first definition in support of popular invention. There are many online samples of acoustic gobos. The phrase more than likely is really a derivative of “goes between.”
A led gobo projector of 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, integrated into 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 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 which the picture is cut out. These are the most sturdy, but often require modifications for 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 of the letter. These can be visible in the projected image, which might be undesirable in some applications.
Glass gobos are made of clear glass with a partial mirror coating to bar the light and create “black” areas inside the projected image. This eliminates any need 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 with an aluminium or chrome coated white and black gobo, or by newer technologies that vary the thickness of the dichroic coating (and for that reason colour) in a controlled way on one part of glass-which assists you to turn one photo right into a glass gobo. Glass gobos generally provide you with the highest image fidelity, however are by far the most fragile. Glass gobos are typically created 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 much less delicate. They may be unfamiliar with the marketplace, as are Leds, along with their durability and effectiveness vary between brands.
In the past, plastic gobos were generally custom made when a pattern requires color and glass does not suffice. However, in a “traditional” (tungston-halogen) light fixture, the main objective point position of the gobo is very hot, so these thin plastic films require special cooling elements to prevent melting. A lapse inside 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 basic and complex stock patterns. In addition they can produce custom gobos from customer artwork. Generally, a lighting designer chooses a pattern from the manufacturer’s catalog. Due to the large number of gobos available, they are generally referred to by number, not name. Lighting technicians may also hand cut custom gobos out of sheet metal stock, as well as aluminum pie tins.
Gobos tend to be utilized in weddings and corporate events. They are able to project company logos, the couple’s names, or almost any artwork. Some companies can make gobo light within per week. Designers rxziif use “stock” gobo patterns for such events-as an example for projecting stars or leaves to the ceiling.
The word “gobo” is also utilized to describe black panels of different sizes or shapes placed between a light source and photographic subject (including between sun light and a portrait model) to manage the modeling effect from the existing light. It will be the opposite of a photographer using a “reflector” to redirect light into a shadow, which can be “additive” lighting and many commonly used. Utilization of a gobo subtracts light coming from a part of an overall 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 in between the sharp subject and unsharp background, called bokeh.