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Lampchanger in the Maughold Head Lighthouse, Isle of Man. This is a model NALC-89, produced by Nav-Aids Systems, LTD, in Kent, England. An automatic lamp changer (or lampchanger) is a device used to ensure that a navigational light such as a marine lighthouse or aero beacon stays lit even if a bulb burns out. Numerous types exist.
Non-dimming variants include having multiple non-adjacent light fixtures such as alternate units in the ceiling 'grid layout,' or daylight source adjacent fixtures near windows or skylights, linked for module on-off switching. Another variant of on-off switching is step switching (sometimes referred to as "bi-level switching"), in which ...
The major advantage of a lighting control system over stand-alone lighting controls or conventional manual switching is the ability to control individual lights or groups of lights from a single user interface device. This ability to control multiple light sources from a user device allows complex lighting scenes to be created.
A thyristor dimmer rack An electrical schematic for a typical SCR-based light dimmer Solid-state , or semiconductor , dimmers were introduced to solve some of these problems. Semiconductor dimmers switch on at an adjustable time (phase angle) after the start of each alternating-current half-cycle, thereby altering the voltage waveform applied ...
This lighthouse was constructed in 1904 and converted to unstaffed automatic acetylene gas operation in 1926. [2] The acetylene lighting installation, controlled by a sun valve, remained in use until the lighthouse was converted to a solar-powered ( photovoltaic ) system in 2013.
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Joel Solon Spira (March 1, 1927 – April 8, 2015) was an American inventor, entrepreneur, and business magnate.. He invented a version of the light-dimmer switch for use in homes around the United States and led his Lutron Electronics Company into the production of lighting controllers.
College football leaders are already exploring changes to a future playoff format, and a re-examination of the selection process is expected as well as complaints pile up.