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lumen

The lumen (symbol: lm) is the unit of luminous flux, a measure of the total quantity of visible light emitted by a source per unit of time, in the International System of Units (SI). Luminous flux differs from power (radiant flux) in that radiant flux includes all electromagnetic waves emitted, while luminous flux is weighted according to a model (a "luminosity function") of the human eye's sensitivity to various wavelengths. One lux is one lumen per square metre.
The lumen is defined in relation to the candela as

1 lm = 1 cd·sr.A full sphere has a solid angle of 4π steradians, so a light source that uniformly radiates one candela in all directions has a total luminous flux of

1 cd × 4π sr = 4π cd⋅sr ≈ 12.57 lm.

View More On Wikipedia.org
Recent contents
  1. RedneckRampage

    Surefire X300U-A Black 1000 Lumen

      1. For Sale
      2. For Trade
    • Clatskanie
    • Oregon
    Like new, got it for my G17 and just don’t really need it. It’s like new, comes with the U and P keys and the slide lock (installed). $235. Can add a Safariland 6xxx holster for G17/X300 for $75 more. Only real trade interests are Surefire 60rd mags or an FRT. Or new USGI mags or 556/45/9mm...
  2. wavebywave

    *** New Never Used - Modlite Light Head - PLHv2 ***

      1. For Trade
    • $150
    • Tigard
    • Oregon
    New, never used, PLHv2 Modite light head. Perfect condition - selling to fund some VV powder purchases. Cash sale only - meet in Tigard. Thanks!
  3. whutdidyousay

    HL-20 1000 lumen weapon light

      1. For Sale
    • $30
    • Beaverton
    • Oregon
    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.
  4. whutdidyousay

    1000 lumen weapon light

      1. For Sale
    • $30
    • Beaverton
    • Oregon
    This is a VERY bright light. It has great reviews online & works VERY well. It comes with an extra set of batteries & the tools and adapters to fit many weapons.
  5. daropowlison

    100,000 lumen Flashlight and Extra Head (Spot/Wide) | BRIGHT! | Imalent | High Quality

      1. For Sale
    • $449
    • Canby
    • Oregon
    MS18 and the MS18W heads. Rechargeable, super bright flashlight. 😎 Details https://www.imalentstore.com/products/imalent-ms18-100000-lumen-flashlight
  6. W

    Streamlight ProTac HL-X 1000 lumen

      1. For Sale
    • $60
    • MOLALLA
    • Oregon
    1 left. Can piece together all they came with (hopefully) from my parts bin. Ridding myself of clutter. $60 each. Local pickup or ship on your dime.
  7. NEPrepper

    Nightstick 1200 Lumen weapon light $50 at Bereli

    Anyone ever try these before? Reviews look good. Been looking for a light for my glock and this might just fit the bill https://www.preppingdeals.net/deals/bereli-nightstick-twm-30-1200-lumen-weapon-light
  8. Stoner

    Surefire X300U-B Tan 1000 Lumen

      1. For Sale
    • $200
    • Hillsboro
    • Oregon
    Like new Surefire X300U-B Tan for sale. 1000 Lumen output, had this mounted on a rifle that rarely left the safe. $200 local pick up I can also ship. Payment via Venmo. PM with phone number for fastest response Not interested in any trades Thank you!
  9. Gunbuggy

    Surefire X300 Ultra (x300u-a) black, 1000 lumen.

      1. For Sale
      2. For Trade
    • $250
    • Vancouver
    • Washington
    Surefire X300U-A Black, 1000 lumens. This is a great weapon light as you all know. Super clean and bright with great throw thanks to the TIR lense. It's in almost new condition, no box, comes with 2 brand new surefire brand cr123a batteries and the different mounting inserts. I'm looking to...
  10. Roadpirate2322

    Inforce 400 Lumen wml fde

      1. For Sale
    • $50
    • Albany
    • Oregon
    Used small mark by button. $50 ftf in Albany $55 shipped
  11. YOURN4M3

    Inforce WML 400 Lumen Gen 2 for sale

      1. For Sale
    • $60
    • Sheridan
    • Oregon
    Like new condition. Battery not included. No issues or defects. Upgraded to something a little larger.
  12. .45's and .38's

    X300 1000 lumen

      1. Want to Buy
      2. Want to Trade For
    • Portland
    • Oregon
    Got cash in Gresham only
  13. jerhine23

    X300u-a black 1000 lumen

      1. For Sale
    • $240
    • Milwaukie
    • Oregon
    Got this less than a month, im sellig it for 240 or trade to x300u-b (t slot).. it doesnt matter what color.. Zero rounds yet..
  14. miketk

    Streamlight pro tac 2.0 2000 lumen

      1. For Sale
    • $120
    • Portland
    • Oregon
    Great condition light 2000 lumens comes with tail switch and a rechargeable battery
  15. H

    Surefire X300U-A Black 1,000 Lumen

      1. For Sale
    • $220
    • Renton
    • Washington
    I have a minty Surefire X300U-A in Black, 1,000 Lumen version for sale. Comes with light and all the factory accessories however I do not have the original packaging. Price is $220 firm - only things I'm interested in trades for are as follows: 1. Colt 6921 Upper - muzzle device cannot be P/W...
  16. .45's and .38's

    Surefire Scout pro DF 1500 lumen

      1. For Sale
      2. For Trade
    • $280
    • Portland
    • Oregon
    Selling for 8 bucks less than I just paid $280
  17. jerhine23

    X300u-b ultra 1000 lumen fde

      1. For Sale
    • $220
    • Milwaukie
    • Oregon
    X300u-b ultra 1000 lumen fde, a little holster wear
  18. geekers

    streamlight TLR-1 HL

      1. For Sale
    • $100
    • portland gresham ish
    • Oregon
    brand new from xmas. opened box the and checked it out and put it back in the box. sells for 130 to 140 ish 1000 lumens with strobe ect ect bla bla bla portland \ gresham $100 or best offer. meaning best for me :D
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