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2. Ring flash - Wikipedia

   en.wikipedia.org/wiki/Ring_flash

   An LED-based ring flash. A ring flash is a circular light that is often operated with a camera lens in the center to take photographs. Unlike point light sources, a ring flash can illuminate a subject with minimal shadows by closely and evenly surrounding the optical axis of the camera lens.

3. LED lamp - Wikipedia

   en.wikipedia.org/wiki/LED_lamp

   A 230-volt LED filament lamp, with an E27 base. The filaments are visible as the eight yellow vertical lines. An assortment of LED lamps commercially available in 2010: floodlight fixtures (left), reading light (center), household lamps (center right and bottom), and low-power accent light (right) applications An 80W Chips on board (COB) LED module from an industrial light luminaire, thermally ...

4. Optical ring resonators - Wikipedia

   en.wikipedia.org/wiki/Optical_ring_resonators

   As subsequent loops around the first ring bring the light to the resonance condition of the second ring, the two rings will be coupled together and the light will be passed into the second ring. By the same method, the light will then eventually be transferred into the bus output waveguide. Therefore, in order to transmit light through a double ...

5. Light-emitting diode - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode

   A small amount of green light, provided by another LED, could correct the problem. [38] Some products are RGBWW, i.e. RGBW with tunable white. [39] A final class of white LED with mixed light is dim-to-warm. These are ordinary 2700K white LED bulbs with a small red LED that turns on when the bulb is dimmed.

6. Motion detector - Wikipedia

   en.wikipedia.org/wiki/Motion_detector

   A motion detector attached to an outdoor, automatic light. A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection).Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area.

7. Ring (company) - Wikipedia

   en.wikipedia.org/wiki/Ring_(company)

   A second-generation model, Ring Doorbell 2, was released in 2017, with updated hardware and a 1080p camera with improved low-light performance, that does not rely solely on Wi-Fi, unlike the original model. [44] The Ring Doorbell Pro interoperates with Amazon Alexa to play prerecorded greetings to visitors and allow visitors to leave a message ...