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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. peteNW503

    Streamlight TLR 1 HL (Glock) 1000 lumen

      1. For Sale
    • $65
    • Portland
    • Oregon
    Used TLR 1- HL black with (Glock key only) fits any Glock with rail. $65 cash for it.
  2. B

    Streamlight HLx Protac 1000 lumen

      1. For Trade
    • Boise
    • Idaho
    Have a HLX protac 1000 lumen light with pressure pad and push button I’m looking to trade for a 30mm scope mount. Preferably qd, thanks
  3. .45's and .38's

    X300 U-A 1000 lumen surefire NIB

      1. For Sale
    • Portland
    • Oregon
    It's like brand new in box with everything $190 Black color
  4. whutdidyousay

    1500 lumen gun light

      1. For Sale
    • $20
    • Beaverton
    • Oregon
    I have 2 of these. They are very bright, but I don't want them. They are both basically new & will come with batteries. Price is firm $20 for one, $40 for both. Pickup in Tanasbourne
  5. D

    500 Lumen "Pistol" Light

      1. For Sale
      2. For Trade
    • $35
    • Boise
    • Idaho
    Ozark 500 Lumen "Pistol" Light. Barely used, were mounted on pic rails for backup PCCs. -Constant on and Strobe Function Mode, Lightweight Aluminum Alloy, Water and Shock Resistant, Genuine CREE XML U2 LED, Uses 1 CR123A Battery (Included). -Lifetime Warranty, company out of Oregon. May...
  6. BrandonQuixote

    TLR-1 HL 800 Lumen

      1. For Sale
    • $100
    • Hillsboro
    • Oregon
    According to the serial this is the 800lumen Model No box, only thumb screw knob $100 Brandon 9514426918
  7. localbrew

    Smith & Wesson M&P Delta Force RM 500 Lumen Flashlight - SPF

      1. For Sale
    • $48
    • Sedona
    • Other
    Smith & Wesson M&P Delta Force RM 1xCR123 500 Lumen Pic Rail Mountable Flashlight with 4 Modes Price $48 shipped - SPF SPECS: 500 lumens with 1 hour 10 minute runtime on High/3 hour 55 minute run time on Low, 1.26 inch head diameter, 4 inch overall length and weighs 3.9 ounce BRIGHTNESS...
  8. Gunbuggy

    Surefire Scout Light - m600, 1k lumen, Modlite Modbutton mount, Ds600 dual end-cap

      1. For Sale
      2. For Trade
    • $300
    • Vancouver
    • Washington
    Up for sale/trade for a limited list of items (see list below) is a great condition Surefire Scout light. It has the Modlite Modbutton mount/pressure switch and it has the dual end cap. I am mostly looking to trade for the following items (+/- cash depending on item, or bundle trades are cool...
  9. O

    Surefire Scout Light Tan 1,000 Lumen

      1. For Sale
    • $350
    • Portland
    • Oregon
    Like new Scout Light with pressure pad switch. $350
  10. K

    Streamlight Protac 2 2000 lumen weapon light

      1. For Sale
    • $110
    • Bellevue
    • Washington
    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...
  11. 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...
  12. 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!
  13. 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.
  14. 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.
  15. daropowlison

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

      1. For Sale
    • $249
    • Canby
    • Oregon
    MS18 and the MS18W heads. Rechargeable, super bright flashlight. 😎 Details https://www.imalentstore.com/products/imalent-ms18-100000-lumen-flashlight
  16. 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.
  17. 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
  18. 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!
  19. 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...
  20. Roadpirate2322

    Inforce 400 Lumen wml fde

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