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The latches secure the shutter in the closed (over the window) position. Tie-back hardware can be used to hold the shutter in the open position. Exterior shutters were vital elements of homes in the colonies. Raised panel shutters provided security against access from ground level. Exterior shutters also proved a first barrier against the elements.
The iris is a metal frame housing designed with an adjustable shutter assembly (an iris). The iris is placed inside fixtures through a specifically designed opening, the accessory (or iris) slot. The iris is placed inside focal plane of fixture, before the lens assembly. An iris is designed to reduce diameter of beam emitted from fixture.
Exterior shutters were originally constructed for light control, privacy, security and protection from the elements. Many areas of tropical Australia, the Mediterranean, Africa, and the American South, feature exterior shutters that block the strong sun from windows. Functional shutters hinge on each side of a window or at the top and swing ...
From left to right: Lamp, Ellipsoidal Reflector, Shutter/Iris Assembly, Fixed Lens, Variable Lens. The opening is the gap in the housing from where the beam of light is intended to come. Many fixtures use a lens to help control the beam of light, though some, such as border or cyclorama lights, do not have any lenses or optics other than the ...
Roll shutters on windows. Security roller shutters in a dead mall. A roller shutter, security shutter, coiling door, roller door or sectional overhead door is a specialized type of door or window shutter consisting of multiple horizontal slats, bars, or web systems interconnected through hinges. The mechanism involves lifting the door to open ...
Field angle is the angle of the beam of light where it reaches 10% of the intensity of the center of the beam. Most manufacturers now use field angle to indicate the fixture's spread typically in this series (5°, 10°, 19°, 26°, 36°, 50°, 75°, 90°). Older fixtures are described by the width of the lens x focal length of the instrument ...
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