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light
Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to visible light, which is visible to the human eye and is responsible for the sense of sight. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), or 4.00 × 10−7 to 7.00 × 10−7 m, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths). This wavelength means a frequency range of roughly 430–750 terahertz (THz).
The main source of light on Earth is the Sun. Sunlight provides the energy that green plants use to create sugars mostly in the form of starches, which release energy into the living things that digest them. This process of photosynthesis provides virtually all the energy used by living things. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps. With the development of electric lights and power systems, electric lighting has effectively replaced firelight. Some species of animals generate their own light, a process called bioluminescence. For example, fireflies use light to locate mates, and vampire squids use it to hide themselves from prey.
The primary properties of visible light are intensity, propagation direction, frequency or wavelength spectrum, and polarisation, while its speed in a vacuum, 299,792,458 metres per second, is one of the fundamental constants of nature. Visible light, as with all types of electromagnetic radiation (EMR), is experimentally found to always move at this speed in a vacuum.
In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not. In this sense, gamma rays, X-rays, microwaves and radio waves are also light. Like all types of light, visible light is emitted and absorbed in tiny "packets" called photons and exhibits properties of both waves and particles. This property is referred to as the wave–particle duality. The study of light, known as optics, is an important research area in modern physics.
^ CIE (1987). International Lighting Vocabulary. Number 17.4. CIE, 4th edition. ISBN 978-3-900734-07-7.
By the International Lighting Vocabulary, the definition of light is: "Any radiation capable of causing a visual sensation directly."
^ Pal, G. K.; Pal, Pravati (2001). "chapter 52". Textbook of Practical Physiology (1st ed.). Chennai: Orient Blackswan. p. 387. ISBN 978-81-250-2021-9. Retrieved 11 October 2013. The human eye has the ability to respond to all the wavelengths of light from 400–700 nm. This is called the visible part of the spectrum.
^ Buser, Pierre A.; Imbert, Michel (1992). Vision. MIT Press. p. 50. ISBN 978-0-262-02336-8. Retrieved 11 October 2013. Light is a special class of radiant energy embracing wavelengths between 400 and 700 nm (or mμ), or 4000 to 7000 Å.
^ Gregory Hallock Smith (2006). Camera lenses: from box camera to digital. SPIE Press. p. 4. ISBN 978-0-8194-6093-6.
^ Narinder Kumar (2008). Comprehensive Physics XII. Laxmi Publications. p. 1416. ISBN 978-81-7008-592-8.
Up for consideration is a solid "do all" wonder 9 pistol. Great home defense piece that can still be carried, excellent ergonomics. It's extremely reliable, high capacity and has one of the best factory striker fired triggers. Since it's not a safe queen, the gun does show some holster and mag...
Bought these planning on carrying My Hellcat.. Both are basically brand new..never carried.. Light was turned on to test..and then went into the safe with the Hellcat..charger included of course.. Trades considered..
I prefer not to ship..but can..on your dime..
Thanks for looking...
Sig Sauer p365 Macro with Holosun enclosed green dot and StreamLight flashlight. This holds 17 rounds of 9mm in a compact package. Built in compensator with night sites. This is the complete/perfect package. Save $200 bucks!! 30 rounds down the pipe!!
Thank you for looking!
I’m looking to mount a light on my 10/22? I have a folding plastic stock on my rifle and looking to put a light on for varmints. Been having a raccoon and possum problem. I’ve seen some options for barrel bands that have rail Sections on them. Wondering if anybody has experience?
Selling Complete or stripped down.
Has thread adapter for Barrel, in case you want to suppresses it. Charge handle hand be moved to either side or Ambidextrous.
Runs very very reliably. Will run most off brand magazines.
Will trade for:
:308 bolt gun with LR/SR Compatible magazines. (Not acs...
There is 1 Trek TEC 22 Strobing light bar with exclusive, wireless remote, 36 LEDs 5500 lumens made by Alpena. $110.00
There is 2 -Track Tec 15inch strobe light bar with exclusive wireless remote, 20 LEDs 3400 lumens made by Alpena. $85.00 Each
There is 2 Hexfire duel work lights.18 LEDs, 1000...
Looking to trade or sell this crimson trace light. brand new just took it out of the box to look it. 110 lumen, ambi controls, and has constant and strobe modes.
I used the batteries out of it. so not included
$30 in Vancouver.
Very good condition (but easily 20 years old) 12ga.
Originally my father’s gun, he cut the barrel down to 18.5”, measured to the breech face. Min length to be legal is 18”.
Unknown round count, but I guarantee not many. Shows well
-includes Streamlight M3 light on fore end.
-Nice fiber-optic...