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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.
I am selling my CZ P10C with or without a surefire light attachment. Comes with four magazines and a 100 rounds of 9mm, also have some defense rounds if you would be interested
Any questions please feel free to message me.
500 without surefire
700 with surefire
Hand built this baby from the ground up, not it looks like im getting a Daniel defense with a little longer barrel, so im letting this go. Barrel has around 200 rounds through it, all brass.
TNW (Made in Vernonia) billet upper
Ballistic Advantage Hanson Barrel 9" w/pinned LoPro gas block...
I've been toying with a silly idea in my head and sketching it out.. but... I want opinions lol.
Okay so Heinkel 162 Salamander/Volksjager.. its got a single jet engine dorsally mounted, pretty sleek lines, just about 30 feet long; relatively lightweight...
Idea. Instead of it being only a...
Great shape less then 200 rounds down the barrel,
Was my edc for a wile, in a belly band, but I just prefer a hard holster so went back to Glock 26
500 as pictured with the stream light, TR6 has light and laser,
Or if you don’t want the light and laser 450 do just the gun
Had it mounted to an FN 509T with about 150 rounds through it while mounted. Great condition. Works like new. Works on several models.
$90 $75 Pickup in or near Salem
$100 $85 Shipped 2-day shipping w/ electronic payment prior. Venmo, Zelle, PayPal, ect.
Thank you for checking out my ad to sell the only weapon I never wanted to part with. But due to some unfortunate circumstances, I must sell it.
I bought this weapon in 2019 from oregon arms and ammunition. It has never failed or even jammed once.
I am solid on the price so no low...
Like new Cloud Defensive Rein weapon light with complete kit. The light has been installed and sat in a safe. Will come with original box, charger, battery, tape switch, original mount, and a haley strategic thorntail pic mount.
Looking to trade for an Aimpoint ACRO. I can add cash or 9mm or...
I ordered this, installed it on my AR pistol then decided to go with the mini. I have this same one on my rifle and it is AMAZING. Both of them are incredible. Pressure switch and QD mount are included. QD mount is for a pic rail and you can mount it at 1 o'clock or 3 o'clock positions (or 9...
Pretty much new Surefire MLOK scout light.
had it mounted on my AR but never actually used it.
I paid 289$ retail for it.
I’m asking 250$ OBO
or part trade for a .300blk upper with cash on my end. Or 300$ worth of ammo in trade.
Local meet up.
Good Afternoon All,
Bought this on a whim and have used it a handful of times, but need funds for something else.
Surefire 2211 Luminox Wristlight and Watch. Has moveable bezel, rechargeable features, three different light settings (300 Lumens / 60 & 15). It is pretty bulky, but solid...
Kimber Light Weight 1911. Well, light weight for a 1911 anyway. 31 or so ounces I believe. New at Christmas, great shape. Very few rounds down range. Nice pistol. Includes box and one magazine. No trades/shipping. Transfer at A Cut Above Pawn - fees the responsibility of the buyer. Thanks for...