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A top hat, also known as a stove pipe or snoot, is a device used in theatrical lighting to shield the audience's eyes from the direct source of the light. [1] It is shaped like a top hat with a hole in the top, and the brim being inserted into the gel frame holder on a lighting instrument.
For power circuits, the color-coding uses the same colors as residential construction, and adds the additional wires used for three-phase systems. Black, Red and Blue are used for hot wires and White is used as the neutral wire in a 120/208 V circuit. Brown, Orange and Yellow are used as hot wires and gray is used as the neutral wire in a 277/ ...
An important property of light fixtures is the luminous efficacy or wall-plug efficiency, meaning the amount of usable light emanating from the fixture per used energy, usually measured in lumen per watt. A fixture using replaceable light sources can also have its efficiency quoted as the percentage of light passed from the "bulb" to the ...
The batting cages at Arvest Ballpark in Springdale, Arkansas in May 2017. A batting cage (or tunnel) is an enclosed area for baseball or softball players to practice the skill of batting. The optimal material for batting cages is netting, and they are typically rectangular in shape.
Electroluminescent wire (often abbreviated as EL wire) is a thin copper wire coated in a phosphor that produces light through electroluminescence when an alternating current is applied to it. It can be used in a wide variety of applications—vehicle and structure decoration, safety and emergency lighting, toys, clothing etc.—much as rope ...
Zone 2 is the area above zone 1 up to a height of 3 m, as well as the area that is horizontally within 0.6 m from zone 1. Older regulations defined zone 3 as the area above zone 2 up to a height of 3 m, as well as the area that is horizontally within 2.4 m from zone 2; from BS 7671:2008, this is replaced by the term outside the zones. This ...