Natural light comes from the sun, while artificial forms of light include: LED grow lights, incandescent bulbs, fluorescent grow lights, etc. Artificial grow light converts electrical energy into a form of light
Photovoltaic solar energy is a clean, renewable source of energy that uses solar radiation to produce electricity. It is based on the so-called photoelectric effect, by which certain materials are able to absorb photons (light particles) and release electrons, generating an electric current. A sem...
When energized, mercury atoms emit energy in the form of light photons. They emit some visible light photons, but mostly they emit photons in the ultraviolet (UV) wavelength range. Because UV light waves are invisible to the human eye, fluorescent lamps have to convert this energy into visible...
Photosynthesis is the process whereby plants absorb light and use it to produce food from carbon dioxide and water. The process starts with a reaction center in the thylakoid membrane of the chloroplast, which contains pigments like chlorophylls, carotenoids, and xanthophylls. These pigments absorb ...
Humans -- and the plants and animals that exist around us -- evolved to follow set natural patterns, such as appropriate times for sleeping and waking, from the tiniest beetles and bats right up to the biggest CEOs and most-relied-upon RNs. We now routinely defy that millions-of-years-...
When the ultraviolet light strikes atom of the phosphors (shown here as white dots), it excites their electrons in just the same way that the mercury atoms were excited. This makes the phosphor atoms unstable, so they give off their excess energy as photons—which, this time, happen to be...
These layers work together to create solar energy in the form of electricity. When the sun’s light, full of tiny particles called photons, hits these layers, it causes a reaction that frees up electrons. These freed electrons create an electric current. The silicon layers of each solar ...
Some types of holograms use lasers that produce different colors of light as well. Depending on the type of laser you're using, you may also need a shutter to control the exposure. Lenses: Holography is often referred to as "lensless photography," but holography does require lenses. However...
When light, in the form ofphotons, hits the solar panel, its energy breaks apart electron-hole pairs. Each photon with enough energy will normally free exactly one electron, resulting in a free hole as well. If this happens close enough to the electric field, or if a free electron and ...
A panel contains many layers of photovoltaic cells. These PV cells absorb photons (tiny particles of electromagnetic radiation) from sunlight and create an electric field across the PV cell layers, generating electricity. One PV cell can only produce a small one to two watts, according to theUS...