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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.
Located in Junction City.
Selling my Surefire M600 Ultra Scout Light. Sat on a rifle that saw pretty low use so no signs of use are seen other than slight discoloration of the white numbering on the head (pictured).
Has 600 lumen output with a great beam pattern.
Comes with original box...
Used but not abused, Surefire X200 for sale. SOLD
Prefer FTF sale in South Salem $50 cash will ship on your dime. Full disclosure: Right side momentary switch is worn out, left still works fine for right handed shooter use support hand thumb, constant on functions work 100%.
Also available RH...
I recently found this bag of stuff that I had forgotten about. It consists of only the finest of tactical accessories Amazon offered in 2012.
Green laser sight comes with a pic rail mount, remote pressure switch, constant on tail cap switch, allen wrench, and a clamp to mount it to a scope...
Used Like new Nightstick LGL-160 Long Gun Light Kit. Comes with the mount you see plus the tape switch, and 90 degree mount accessories in the original box with batteries. Will ship if you pay the exact cost of shipping through USPS
I have 2 of these. They are very bright, but I don't want them. They are both basically new & will come with batteries.
Price is firm $20 for one, $40 for both.
Pickup in Tanasbourne
Reposting because deal fell through. Lightly used HK P30 V1 Light LEM. I am the original owner and fired about 150 rounds. 2 - 17 round and 6 - 20 round factory HK mags. All mags are out of packages and have been loaded, but only 2-3 have been fired. This gun just sits in my safe. It has the...
Mounted but never shot with. 1000lumem light. Comes with both mlok and pic rail mounts and a clicky tailcap. Sorry no box though.
These sell online for $300-350 new
Im looking for $200obo
I do accept paypal f&f and can ship free if buy at asking price otherwise additional $10 if lower than...
Up for sale, Glock 48 mos. Has ameriglo night sights. Comes with 4 shield mags, two have extended base plates, and two oem mags. Also comes with tlr 7 sub light and two holsters. I do not recal name of one holster, but allows for light. The other holster is a Phlster skeletonized and is by...
Modlite OKW Duel Fuel head,18350 body, rifle light with tail cap and battery.
Arisaka offset scout mount (m-lok)
Unity Hot Button.
Modlite, battery and scout mount are brand new. Hot button is lightly used.
Would trade for a vortex defender xl or trade towards MOS versions of Glock 19,17, or 45.
View: https://imgur.com/a/gIbDw10
Great condition, $175 cash picked up or meet up in SE Portland or $182 shipped conus via discreet paypal or venmo.
Will trade for equal value of 10mm target ammo at 38cpr or higher cpr for defensive rounds.
Sig tread M400 rifle chambered in front 556 only 200 rounds through it.
1(30) round Pmag
$650 cash I will pay transfer prefer to use adaptive firing solutions. Otherwise buyer pays transfer and bc . Optic not Included
Had on a gun that mostly sits in the safe. Was mounted and used but lens very clear and body as well. Comes in original box with all mounts, switches, etc like when new
$140 on Amazon… get yours cheaper. Meet up in Milwaukie area. Available most times
New never used Surefire M952 kit, M952 mounted on A.R.M.S. #17, includes pressure pad cable, FM63 IR filter and an extra incandescent bulb. Only took out of the package to install a Lumens Factory 1,100 lumen drop-in led to make it actually real world useful and for pictures. New ollllld stock...
Used Glock 21 Gen4
slide release upgraded
fiber optic front sight black out rear.
Light bearing IWB for a TLR1HL
DPM reduced recoil system
Stock guide rod and recoil spring also included
3(13) round magazine
$450 cash buyer pays transfer fee and background check. Buyer will be given free...