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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.
Asking $100 flat shipped priority padded envelope with tracking for a like new STREAMLIGHT TLR-7A in FDE. Have everything it came with and it is a gen 2. Welcome to message me here or text me at 509-480-9240. Thanks and located in Yakima.
Recently picked up an older 10-22 sitting in a fat barrel channel stock. Building this one for my son, so looking for a .920 light weight barrel to fill the stock correctly. Not overly picky about color, make, grooves, threading, etc, as long as it shoots straight. Trying to put this together on...
Bought this but decided to stay with my current setup. Never even mounted it. I eat the tax and shipping, you come out $25 ahead.
I bought the green laser, black, potted version. https://www.somogear.com/product/somogear-peq-15-airsoft-aiming-laser-ir-illuminator/
$265 please PM me as I don't...
Safariland 7378-8325 ALS light bearing holster for Glock 19/17/34 Gen 5.
*NOT RDS compatible
Condition is well worn, but it works perfectly fine.
Can include either a high ride or a low ride universal belt loop as well.
$45.00
Thanks for looking
Have a unused temporary Android S10…I was a hold out for iOS…. I believe it’s unlocked from what I’ve read on internet. Multiple carriers available. The old sim is still in it but I guess we use a new kind of SIM which this one has the old number but isn’t activated. I’m pretty ignorant about...
New Streamlight 350 lumen Protact mount light. It's the compact one battery version. Good for rifles and PCCs.
New in box. $75 Firm. That's what I have into it.
Buyer comes to McMinnville to pick up. No trades. No shipping.
Private message if interested please.
T-Rex Sidecar holster. Gen1-4 Glock 21 with Surefire X300 light. I bought it hoping that it would fit my Gen 5 Glock 21, but it does not. My loss is your gain. Cost me $140 + shipping. Asking $40 OBO no trades
Anyone ever try these before? Reviews look good. Been looking for a light for my glock and this might just fit the bill
https://www.preppingdeals.net/deals/bereli-nightstick-twm-30-1200-lumen-weapon-light
Up for sale is my lightly used P365 X Macro/XL grip module. Has a new NDZ Performance magwell and Olight PL-Mini 2 Valkyrie 600 lumens weapon light. Light recharges with included magnetic USB cable.
$120 shipped
PayPal friends & family or Venmo gladly accepted here.
Not looking for trades...
I have a very nice P226 Legion with the factory Romeo 1 red dot, Sig Sauer Foxtrot 1 weapon light and Silencerco Threaded barrel.
Comes with (3) 15rd mags and all the factory paperwork including the legion case.
Buyer pays transfer,
No trades.
Hello all, Reposting with updated price and breakdown of the different rounds. Ammo was taken out of package to confirm numbers.
I have 176 rounds of hard to find Bulgarian heavy ball ammo in great shape. This is good stuff but not recommended for anything other than bolt guns (Corrosive)...
Bought these when they were clearing them out. They’ve been on guns in the safe, but not holstered, or used much. Will ship without a battery, $5. Two available one available at $75 each
Like new Tikka stainless fluted ultra light 308, ten rounds through it,comes with Burris 3x9x50,2.0 rail,limb saver butt pad,2 mags,1-3,1-5 Rd,Tikka bag,ammo,got 1400 in it asking 1000 cash and safari sling
Sig Sauer P226 Legion RXP with threaded barrel, Legion light, and Sig red dot. This thing has it all. It comes with the original barrel as well. 9mm masterpiece! Comes w the original three mags, case, and coin! Thanks for looking!