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Harbor Freight Tools, commonly referred to as Harbor Freight, is an American privately held tool and equipment retailer, headquartered in Calabasas, California. It operates a chain of retail stores, as well as an e-commerce business. The company employs over 28,000 people in the United States, [5] and has over 1,500 locations in 48 states. [6] [7]
In the US lighting industry, foot-candles are a common unit of measurement used by architects to calculate adequate lighting levels. Foot-candles are also commonly used in the museum and gallery fields in the US, where lighting levels must be carefully controlled to conserve light-sensitive objects such as prints, photographs, and paintings, the colors of which fade when exposed to bright ...
In optics, wall-plug efficiency or radiant efficiency is the energy conversion efficiency with which the system converts electrical power into optical power. It is defined as the ratio of the radiant flux (i.e., the total optical output power) to the input electrical power.
The Copper Harbor Front Range Light is in Copper Harbor, Michigan. [1] While the Copper Harbor Light effectively illuminated the area of the harbor, it failed to guide mariners through the narrow opening of rocks at its entrance. [2] Construction on the range lights were completed in 1869.
The light-second is a unit of length useful in astronomy, telecommunications and relativistic physics.It is defined as the distance that light travels in free space in one second, and is equal to exactly 299 792 458 m (approximately 983 571 055 ft or 186 282 miles).
The windows of the lantern house are covered in wood. The light was constructed in 1873 on Bayley's Wharf, a short way west of its present location, along with the rear range light, which stands near Water Street. The light was converted from coal-based power to electricity in 1933, and automated in 1952.