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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.
Darn near brand new TLR7A. Bought it for my Glock but ended up finding a better deal on an FDE light that matches my pistol. Comes with the box and all the adapters. Meet in southeast or Milwaukie.
Used but in good working order
No mount included
Momentary tail cap
Malkoff E1HTV2 - 400 lumen -18k candela
There is a little bit of carbon from the first few shots but then I moved it back.
Works great and you can test function before buying
Will come with extra CR123
Cloud Defensive REIN Gen 2 Weapon Light - OD Green and arisaka mlok offset mount.
Will trade for a Surefire M640 DFT Black or Tan
I accept cash and PayPal (friends and family).
I Will ship for an additional $10.
*I am traveling until the 15th of April*
Im here for a day or so then I keep heading out.. so meet times or shipping will have to be between when I’m in town or simply after the 15th of April.
Purchased this light wanting to go a certain route for a pistol build. I’ve since changed directions...
Safariland-used, hood was modified for an ACRO but it will still fir an RMR.
Trex- will include the incog light and batteries that fit
Will trade for a a surplus M12 holster, Alice mag pouches, alice shoulder straps
Steiner TOR Fusion pistol light + visible green laser combo.
Adjustable key to fit most modern pistols. Choose between light, light + laser, or just laser. Light is also adjustable (low, med, high 470 lumens).
Bought, mounted and never used. It presents as new. Box, card with QR code for...
Taurus 85 Ultra light, the stainless steel version. Shoots 38 special. It was a carry gun of a family member and occasional target shooting gun. It's a bit dirty but I took several pictures so you can make your own judgements. Serial blured in one pic. It was carried lots until he got a new semi...
Surefire scout rifle light
May have a pressure pad to come along with
has standard clicker on it currently
Can send more pics upon request
looking to trade for the following delta point pro used, surefire x300 blk used, g19 safariland holster that accomadates red dot. Can add more depending...
Used but in like new shape
Come with insight light and pump comb works
3 inch 12 gauge chamber
18.5 in fixed choke (cylinder bore)
$275 obo transfer included at Al ammo llc
Will ship for $25 to a ffl
Open to trades of greater value
Call or text at 3609310464
Saw some at Alleycat Supply in Boring for $50 while sourcing materials for a BHD style sling. I don't know anything about Glocks or what specific model it fits but a brief online search shows these are still selling between $70-$100 depending on where you get it from. Sorry no pictures.
I picked up some unknown steel case 7.62x54r from a pawn shop, and opened up a can from 1972. to feel better about using these I pulled the bullet from one of each. One has a silver tip, the other does not, but both look exactly the same. both have a 148gr boat tail bullet, and 48.5 of extruded...
Here are 2 spam cans of 440rnd light ball Albanian surplus. Mild steel core and brass case. This stuff is lots of fun to shoot and puts out massive fire balls.
Selling this for cheap! Its the older model that has the NiCad batteries instead of the newer kind of batteries, but it's very lightly used and works good.
It comes with the following-
Carrying Case
DW988 18V Heavy Duty Drill / Hammer Drill
18V XR+ NiCd Battery
DW939 18V Circular Saw...
I have a mini scoutlight pro (m340c), with an SR07 tape switch and UE end cap. It's in great shape, hardly used with only a couple dings in one small area shown in the photos.
I want to sell it to buy the non-pro version that has the older mounting style so I can use a modbutton mount.
Before...
A new in box CMR-204 with a fresh battery. Bought new and never used. Comes with all the adjusting tools, rail adapters etc. Retails for 379.00 on CT's website, or about 325 on Amazon. $250 for an easy sale. Buyer pays shipping. If you pay with a check or similar I'll hold the item for...
This is an awesome light, but it's just not my thing. Cash only, pickup in Tanasbourne. Comes with an extra set of batteries & all of the tools/adapters it came with new.
Selling a Modlite PLH-V2 weapon light for long guns. It’s got an 18650 body and a clicky tailcap. Also on an arisaka offset mlok mount. In very good condition and is very bright. This high candela light competes with the brightest lights on the market and has the basic accessories need to plug...