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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.
TUSK Helmet Light System up for trade. Like new in the box complete with all wiring and mounting hardware, hell I even still have the instructions! Glock stuff, AR stuff, multicam stuff, bump cap, ammo...🤷🏼♂️ Don't really know what I want, so what do you got? DM offers to keep a clean thread.
HK VP9 Tactical w/PMM Comp and PL350 + Matching Active Retention Holster
I DONT BELIEVE I CAN SELL THIS TO A FELLOW WASHINGTONIAN.
$850 shipped OBO
About 100 rounds on the firearm. Comes with:
Modlite PL350
Midwest Tactical Solutions Enforcer Level 2 light bearing Holster in Frogskin...
Anyone running the Streamlight TLR6 weapon light/lazer for their non railed 1911? If so, what are your experiences as far as it holding up to recoil abuse...
MP Bullet Mold - .308 / .300 Blackout - 311-410 Hollow Point - Plain Base - 4 Cavity Brass
Cast .311 cal. bullets (easily sizes down to .308 if needed)
314-410 Lyman clone
Big round, small round and blank pins included
solid 135gn., 124gn big round, 129 small round with WW alloy
Steel sprue...
This is a surefire light for the MP5
This model has the constant on off and momentary, functions good it’s a white light
Has few scratches on the light body, under the strip of tape where my wrench slipped. Now l use a piece of black tape to change batteries out
$300
I can ship w PayPal
Hello all,
Selling my Streamlight Pro tac 2 weapon light.
Never mounted and have pretty much used it around the house occasionally as a flashlight. In excellent shape.
Great light that's really bright, but just a little bigger than I anticipated.
2000 lumens, w/rechargeable battery...
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.