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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.
Not gonna be the best quality of course but I picked one up as a backup to my Streamlight. Lowest price ever on the graph
https://www.preppingdeals.net/deals/amazon-ade-advanced-optics-200-lumen-weapon-light
I used it often when working traffic stops or just needed a work light without pulling out my flashlight. Works great, all of the LEDs work. I no longer need it. Blue/Blue/White lights Plus a red working light. Includes epaulette mount.
*Lightweight – Approximately 3 Oz
*Durable – Water proof...
New in box. No I don't have pictures of the actual item, but I will upon request only. Otherwise it's staying in the original box.
Glass Lens, glare free and neighbor-friendly, stable bright white 5000K light for outdoor security lighting.
Durable die-casting aluminum
Topgrade LEDs and...
New in box.
Tested with battery hook-up and they are BRIGHT!
These things are huge; made for semi-trucks, but you can use them on RV's, trailers and so on. Only limited to your imagination.
$80 shipped to youuu!!!!!!!!!!!!! Continental United States only.
PayPal preferred, but will also...
Selling a really nice M500 Handguard, no cracks in the pressure pads, has white nav lights. These things are great with a Lumens Factory drop in LED. Only selling so I can buy something else I “need”. $125 FTF/$145 shipped.
OBO. Cash ONLY. No Trades. Transfer fee paid by buyer. Transfer to be handled by Highline in Newberg, Oregon.
Low round count (less than 500) G34.5. Comes with factory case, optics plates, grips, as well as:
Surefire X300U-B Ultra LED Weapon Light
Safariland 6365RDS-6832 Low-Ride, Level III...
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...