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 use them with stage lighting instruments to manipulate the shape of the light cast over a space or object-for example to make a pattern of leaves on a stage floor. Sources
The word “gobo” has arrived to sometimes refer to any device that produces patterns of light and shadow, as well as other items who go before a light (for instance a gobo arm or gobo head). In theatrical lighting, however, the phrase specifically describes a product put into ‘the gate’ or at the ‘point of focus’ between the source of light and also the lenses (or other optics). This placement is very important because it creates a crisp, sharp edged pattern or design (of logos, fine detail, architecture, etc.). Gobos placed following the optics do not generate a finely focused image, and therefore are more precisely called “flags” or “cucoloris” (“cookies”).
he exact derivation of gobo is unclear. It 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 phrase is traced returning 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 specific direction, without any application to optics. The treatment of the word as an acronym is recent and ignores the initial definition in favor of popular invention. There are numerous online types of acoustic gobos. The term probably is a derivative of “goes between.”
A gobo light projector in the Earth, projected utilizing a halogen projector. Gobos are used with projectors and simpler light sources to produce lighting scenes in theatrical applications. Simple gobos, integrated into automated lighting systems, are popular at nightclubs along with other musical venues to generate moving shapes.Gobos could also be used for architectural lighting, plus in interior decorating, like projecting an organization logo over a wall.
Gobos are created from various materials. Common types include steel, glass, and plastic. Steel gobos or metal gobos use a metal template that the image is eliminate. These are the most sturdy, but often require modifications for the original design-called bridging-to show correctly. To correctly represent the letter “O” for example, requires small tabs or bridges to support the opaque center in the letter. These could be visible within the projected image, which can be undesirable in some applications.
Glass gobos are made of clear glass with a partial mirror coating to block the sunshine and create “black” areas in the projected image. This eliminates any need for bridging and accommodates more intricate images. Glass gobos can also include colored areas (much like stained glass windows), whether by multiple layers of dichroic glass (one for each and every color) glued on an aluminium or chrome coated white and black gobo, or by newer technologies that vary the thickness in the dichroic coating (and thus the color) in a controlled way on one part of glass-which makes it possible to turn one photo in to a glass gobo. Glass gobos generally provide 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 can be utilized in LED ellipsoidal spotlights. These “LED Only” plastic gobos could be full color (just like a glass gobo), but are far less delicate. They may be new to the marketplace, as well as Leds, and their durability and effectiveness vary between brands.
Before, 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 a gobo is extremely hot, so these thin plastic films require special cooling elements to stop 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. In addition they can produce custom gobos from customer artwork. Generally, a lighting designer chooses a pattern from the manufacturer’s catalog. Because of the multitude of gobos available, they are generally known as by number, not name. Lighting technicians may also hand cut custom gobos away from sheet metal stock, or perhaps aluminum pie tins.
Gobos tend to be used in weddings and corporate events. They can project company logos, the couple’s names, or virtually any artwork. Some companies can turn glass gobo after as little as a week. Designers rxziif use “stock” gobo patterns for these particular events-as an example for projecting stars or leaves onto the ceiling.
The phrase “gobo” is also used to describe black panels of numerous sizes or shapes placed between a light source and photographic subject (such as between sun light along with a portrait model) to control the modeling effect of the existing light. It will be the complete opposite of a photographer using a “reflector” to redirect light right into a shadow, which is “additive” lighting and a lot frequently 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 show with wider open apertures giving soft natural transitions in between the sharp subject and unsharp background, called bokeh.