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  2. Diffraction spike - Wikipedia

    en.wikipedia.org/wiki/Diffraction_spike

    Diffraction spikes are lines radiating from bright light sources, causing what is known as the starburst effect [1] or sunstars [2] in photographs and in vision. They are artifacts caused by light diffracting around the support vanes of the secondary mirror in reflecting telescopes , or edges of non-circular camera apertures , and around ...

  3. Bird control spike - Wikipedia

    en.wikipedia.org/wiki/Bird_control_spike

    A bird control spike, also known as an anti-roosting spike, [1] pigeon spike, or roost modification, is a device consisting of long, needle-like rods used for bird control. Bird control spikes can be attached to building ledges, street lighting , and commercial signage to prevent wild or feral birds from perching or roosting.

  4. Precision approach path indicator - Wikipedia

    en.wikipedia.org/wiki/Precision_Approach_Path...

    The PAPI can be seen to the right (non-standard) side of the runway. The aircraft is slightly below the glideslope. A precision approach path indicator (PAPI) is a system of lights on the side of an airport runway threshold that provides visual descent guidance information during final approach.

  5. Emergency light - Wikipedia

    en.wikipedia.org/wiki/Emergency_light

    An emergency light is a battery-backed lighting device that switches on automatically when a building experiences a power outage. In the United States, emergency lights are standard in new commercial and high occupancy residential buildings, such as college dormitories, apartments, and hotels.

  6. Commercial Light Company - Wikipedia

    en.wikipedia.org/wiki/Commercial_Light_Company

    Commercial Light Company is an Illinois electrical contractor and engineering company, which has performed the electrical work for many Chicago buildings. [ 1 ] [ 2 ] [ 3 ] It is located at 245 Fenel Lane, Hillside, Illinois , and is one of the village's largest employers.

  7. Lighting control system - Wikipedia

    en.wikipedia.org/wiki/Lighting_control_system

    Lighting control systems are widely used on both indoor and outdoor lighting of commercial, industrial, and residential spaces. Lighting control systems are sometimes referred to under the term smart lighting. Lighting control systems serve to provide the right amount of light where and when it is needed. [1]