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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.
Safariland 3084-73 Light bearing holster.
Just the holster no qls forks or anything. Missing one of the little locking screws but the QLS forks you need to order for this comes with them.
Fits M9a3 / A4 / 92fs etc etc.
30 dollars takes it as is. 35 dollars shipped.
Will trade for two...
Beretta PX4 Storm, full. Awesome gun, well taken care of. Have case it came in, laser light, different backstraps and loader. Will post pic $600 obo.
Link for info
https://en.m.wikipedia.org/wiki/Beretta_Px4_Storm
Two "lightly" (see what I did there) used weapons lights. They're both Surefire M720V weapons lights with QD mounts.
They are perfect for your home defense rifle as they won't over illuminate the inside of your house and they can run infrared light for you LARPers with the NVGs. Or for this of...
Tony Cowden. Amazing career. Worth a listen. Very interesting background and career with SF and CIA.
This is among the most intense single-man gunfights ever recounted on the Shawn Ryan Show, and quite literally on any podcast. Tony Cowden shares the raw details of a prolonged engagement after...
I had an incident that happened one night a week ago that I'll not discuss at this time.
It really got me thinking that I absolutely must have a light bearing holster for the XDM.
I've done some checking online and I'm not liking what I see. I needs help.
I am used to this style of holster so...
Hi all,
I am shipping a 870 fore end back to surefire for fixing, they say ship FedEx or UPS?
Any suggestions as to which is better, more competent, less issues, etc. would be appreciated?
Thanks, Southpaw!
27 rnds of Fed 180gr. Partition, 20 rnds of Hornady custom lite 125gr. SST, 20 rnds of Barnes vor-tx 180gr. TTSX BT, 40 rnds of Rem 180gr. Core-lokt PSP, 40 rnds. Of Rem 150gr. Core-lokt PSP, 40 rnds of hand loaded mix of 150&180 gr. That I did not load.
They came as part of a deal from another...
I need a light for a railed 1911. i just want a white light. No lazerballs blah blah. I’ll pay for a Surefire if that is my best option, or whatever else might be top of the heap in terms or reliability/durability.
This would mostly be for within the home or other close-in environments. The...
Looking to trade my Cloud Defense Rein 1.0 for another weapon light.
No issues with the light at all I just want another push pad style.
Text me 9713376226
I had this on my MK18 but need a black Surefire scout for my new virtus
My Surefire comes with a nice fancy Surefire tailcap and Unity hot button.
The head is KE1H
It’s mounted on a Arisaka inline 1913 rail mount
The mount alone was $70 and the hot button etc
I have other mounts that I can...
Streamlight TLR-8 AG | (Green Laser / Light Combo)
This is a great light/laser combo and would be keeping it if I didn't need some money.
*New in Box. Details...
Selling to fund my next project.
No trades, please.
Purchased new, mounted momentarily and it has never left the house. Appears fresh out of the retail box (not available) and functions as it should. $50 no shipping, buyer comes to Philomath for pick-up. If you want me to hold this I accept Pay Pal using "Sending to a friend" option or cover the...