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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 6360 ALS/SLS RH Level-3 MULTICAM Holster SIG P226 w/ LIGHT M3
If you want snug get an ALS holster as it clicks in on the side of the slide. SLS only holsters slide in holsters without a perfect fit and are made for quick pulls and not made to be tight and are generally multifit...
Been sitting the safe, in a box, doing nothing for about a year. Works perfectly it's literally like new.
Tech specs: https://www.amazon.com/Nightstick-TW.../dp/B073S29YHX
$55 shipped
Selling a Surefire M600u. Comes attached to an Arisaka picatinny mount.
Surefire doesn't make these anymore unfortunately, and I have decided to sell this to fund a clone build.
This is one of the last great lights they ever made, it has great output and throw, beats the heck out of the newer...
McCain Traffic Supply 3 way traffic light. 34" tall. 44" including hanger. 120v. Will need wired. I wired one with a $30 timer from Amazon so it would go through a sequence. You can just wire it straight up without a timer, and all lights will just stay on. Its cool no matter how it's set up.
$150
I've got some old school m3x tactical illuminator halogen lights. 1913 rail compatibility. I think I have 5 of these. The thought is sell all 5 for one new LED pistol light. $30/ light. They are all in good shape, have a focused beam or flood beam that is easily adjustable, and if memory serves...
Glock 19 Gen 5 9mm
Agency Arms Trigger with 3.5 lb bar
Faxon TiN Barrel
Extended Slide Release
Extended Mag Release
Extended Takedown TiN
Holosun 507C-X2-ACSS Red ACSS VULCAN with Solar Cell
Trijicon Night Iron Sights
Streamlight TLR-7A
TiN Pins
Zaffiri Precision ZPS.2 Slide
Less than...
Looking for anyone who has and is willing to sell an OWB preferably drop leg hard holster from safariland that will fit my Glock 19 with a red dot and light on it.
Modlite OKW for sale
- OKW light head
- Modlite 18650 light body (FDE)
- surefire UE tail cap
- Modlite mod button with HRF Concepts ramp
Will come with
X3 18650 batteries (no charger but they’re pretty cheap online)
X2 mounts.. Cloud Defensive pic rail mount and arisaka in-line scout...
Had this on my 870 marine magnum, works great, very bright, around 250 lumens....LED....ambi pressure switches...fits directly to an 870 with no mods other than swapping the forend....
Asking 200 shipped/insured....offers considered....brand new 123 battery included
Unused Protech by Safariland light weight 10x12 Type III special Threat rifle plates. Plates are Multicurve and ultra light weight with built in spall and back padding for deformation. Each plate cost me $595 I have a set of 2 for sale. Asking $500 or best offer for the set. Both are in new and...
Selling my p365 macro. Comes with box and all the original parts/books. 2 macro mags. Less than 100 rounds fired. Also includes:
- Icarus grip. Macro mags hang low. 12 rounders fit flush without extenstions. 15 rounders should look amazing with the Icarus mag extension.
-2x icurus mag...
Salty cloud OWL, comes with the charger and 2 batteries. The light is an absolute tank, beam pattern and light temp are awesome. Just doesn’t fit in any of my builds right now. Lookin for Cash or ammo
Cloud Defensive OWL in FDE. Comes with box, Nitecore pro charger, and 2 rechargeable batteries. Amazing performance and this thing is probably the most bombproof light you can buy, I just need something smaller to fit in new vehicle rack mount.
Can meet in the gorge area or can ship.
Ithaca Model 37 feather light 12 ga
Fixed Full choke barrel.
All original in good shape for its age has slight wear and tear from normal use. Slight wear on bluing showed in pic.
Looking to get $600
Open to trades equal in value
I have a catch a release like new Cloud Defensive Micro Rein 2.0 in ODG. Comes with all the original stuff, box and paperwork, battery, charger, pic mount, pressure switch, charger. I was told it's never seen live fire and it looks excellent. I just decided I want a black light instead.
$325...