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2. Grow light - Wikipedia

   en.wikipedia.org/wiki/Grow_light

   Grow light. Ficus plant grown under a white LED grow light. A grow light is an electric light that can help plants grow. Grow lights either attempt to provide a light spectrum similar to that of the sun, or to provide a spectrum that is more tailored to the needs of the plants being cultivated (typically a varying combination of red and blue ...

3. List of reported UFO sightings - Wikipedia

   en.wikipedia.org/wiki/List_of_reported_UFO_sightings

   NUFORC has collected over 100,000 UFO reports spanning decades. The most common description was of "lights" in the sky, and many UFOs were of an "unknown" or "unspecified" shape. Others included: cubes (16), cones (600), crosses (491), teardrops (1221), and stars (138). Arranz, Adolfo (24 December 2017).

4. Marfa lights - Wikipedia

   en.wikipedia.org/wiki/Marfa_lights

   The Marfa lights, also known as the Marfa ghost lights, are a light phenomenon regularly observed near Marfa, Texas, in the United States. [1] Onlookers have attributed them to a number of paranormal phenomena, including ghosts, UFOs, and flying dinosaurs, among other things. [1][2] They are most often seen from a viewing area nearby, which the ...

5. Light-emitting diode physics - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode_physics

   A LED is a long-lived light source, but certain mechanisms can cause slow loss of efficiency of the device or sudden failure. The wavelength of the light emitted is a function of the band gap of the semiconductor material used; materials such as gallium arsenide , and others , with various trace doping elements , are used to produce different ...

6. Photosynthetically active radiation - Wikipedia

   en.wikipedia.org/wiki/Photosynthetically_active...

   Photosynthetically active radiation (PAR) designates the spectral range (wave band) of solar radiation from 400 to 700 nanometers that photosynthetic organisms are able to use in the process of photosynthesis. This spectral region corresponds more or less with the range of light visible to the human eye. Photons at shorter wavelengths tend to ...

7. LED lamp - Wikipedia

   en.wikipedia.org/wiki/LED_lamp

   Contents. LED lamp. A 230-volt LED filament lamp, with an E27 base. The filaments are visible as the eight yellow vertical lines. An LED lamp or LED light[ 1 ] is an electric light that produces light using light-emitting diodes (LEDs). LED lamps are significantly more energy-efficient than equivalent incandescent lamps and fluorescent lamps ...