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  2. Twilight switch - Wikipedia

    en.wikipedia.org/wiki/Twilight_switch

    Probe placed on top of a wall. A twilight switch is an electronic component that allows the automatic activation of a lighting circuit when natural light drops in a given environment. Among a large number of uses, the most common is to enable automatic lighting of streets, roads, highways, roads, gardens, courtyards, etc., when sunlight drops ...

  3. Lighting control system - Wikipedia

    en.wikipedia.org/wiki/Lighting_control_system

    The term lighting control system refers to an intelligent networked system of devices related to lighting control. These devices may include relays, occupancy sensors, photocells, light control switches or touchscreens, and signals from other building systems (such as fire alarm or HVAC). Adjustment of the system occurs both at device locations ...

  4. Photoresistor - Wikipedia

    en.wikipedia.org/wiki/Photoresistor

    Three photoresistors with scale in mm Large CdS photocell from a street light. A photoresistor is less light-sensitive than a photodiode or a phototransistor.The latter two components are true semiconductor devices, while a photoresistor is a passive component that does not have a PN-junction.

  5. Twilight Sentinel - Wikipedia

    en.wikipedia.org/wiki/Twilight_Sentinel

    The Twilight Sentinel system uses a photoelectric cell to measure ambient light levels. This cell is typically mounted on the dashboard of the vehicle. [7] The system is designed to activate the vehicle's exterior lights when the ambient light falls below a certain threshold, typically corresponding to twilight conditions.

  6. Building automation - Wikipedia

    en.wikipedia.org/wiki/Building_automation

    A photocell placed outside a building can sense darkness, and the time of day, and modulate lights in outer offices and the parking lot. Lighting is also a good candidate for demand response, with many control systems providing the ability to dim (or turn off) lights to take advantage of DR incentives and savings.

  7. SF county supervisor calls for 'mass arrests, detox, and ...

    www.aol.com/news/sf-county-supervisor-calls-mass...

    (The Center Square) - San Francisco County Supervisor Matt Dorsey, a Democrat and former addict, is calling for “mass arrests, detox, and treatment” of open-air, often homeless drug users in ...

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