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Thread: Amount of light loss through Surefire F04 diffuser?

  1. #1
    Flashaholic
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    Default Amount of light loss through Surefire F04 diffuser?

    The flashlight geek in me wants to know:

    How much light is lost if I stick my F04 diffuser on my E1L or U60GT?

    I'd say it's quite a lot but how much is it? 40%? more?

    Anybody with a light measuring system want to give this a go?
    Last edited by warpdrive; 09-18-2006 at 09:48 PM.

  2. #2
    Flashaholic* chesterqw's Avatar
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    Default Re: Amount of light loss through Surefire F04 diffuser?

    40%!?!

    man i don't know how much it is.. but it should be less then 10%.
    if killing was legal, i would have killed countless number of people...

  3. #3
    Flashaholic* John N's Avatar
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    Default Re: Amount of light loss through Surefire F04 diffuser?

    Dunno how much, but you can get an idea of how it will look in this post.

    -john

  4. #4

    Default Re: Amount of light loss through Surefire F04 diffuser?

    On a single level light like the Streamlight TL-2 LED with an intense hot spot which renders it unsuitable for close range tasks the Surefire diffuser makes a big improvement.

    I never worried about how much light was "lost", I was always just thankfull for the reduced glare. I use the FM34 Medium Angle Beamshaper on a Scorpion LED for one of my BOB lights. IMO choosing a multilevel light would greatly reduce the need for add ons like diffusers. Backsplash and glare are just as easily solved by using less lumens to begin with.

    Paladin

  5. #5
    Flashaholic
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    Default Re: Amount of light loss through Surefire F04 diffuser?

    Based on ceiling bounce test I would guesstimate it to 15%, but it was only when I was switching very fast between them I could see the difference, so it does not matter much.
    "Constantly talking isn't necessarily communicating."

  6. #6
    Flashaholic* Long John's Avatar
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    Default Re: Amount of light loss through Surefire F04 diffuser?

    An alternative for a diffuser could be a white reflective beacon.
    I own a yellow one and I'm very inspired.
    I have the subjective impression, it added brightness.
    Take a look here:

    http://www.candlepowerforums.com/vb/...d.php?t=133336

    It's a very useful addition for every light with a max headdiameter of 3cm.

    Best regards

    ____
    Tom

  7. #7
    *Flashaholic* Size15's's Avatar
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    Default Re: Amount of light loss through Surefire F04 diffuser?

    Quote Originally Posted by chesterqw
    40%!?!

    man i don't know how much it is.. but it should be less then 10%.
    Correct.
    The F04 and FMx4 BeamDiffusers (aka BeamShapers) use a highly specialised (and expensive) LSD® Light Shaping Diffuser featuring holographically recorded, randomized surface relief stuctures that enable High Transmission Efficiency (up to 92%), and Controlled Angular Distribution, while providing high quality Homogenised Light. The material is a 'shatter-proof' polycarbonate.
    The BeamDiffusers increase the area illuminated by the beam by a factor of 25.

  8. #8
    Flashaholic
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    Default Re: Amount of light loss through Surefire F04 diffuser?

    Damn Al,

    There were more three-dollar words in that reply than a lawyer's "summation" to a jury. I had to get my dictionary offen the peg in the outhouse and bring it into the house just to cifer it. 10% would have been my guess also, but you plum dressed it up pertier.

    Flashdark sends, edumicated.
    A flashdark is a device that projects a black circle upon (thereby obscuring) anything which is visually offensive. Surefire: E1e/KL1(2), E2L, E2e, E2C/P-61, KL2, KL3(1,2v3), KL4, L1-RD(1), L1-WH(1,2), L2(1), L4, L5, L6, G2, C2, U2, K2, M2, C3, M3, M3T, M6. Milkyspit: ML-1, MilkMite. Photon: Freedoms(WH/RD/TQ).

  9. #9
    Enlightened
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    Default Re: Amount of light loss through Surefire F04 diffuser?

    Size15 was spot on.

    Just did some quick, crude measurements with an F04.

    2AA MiniMag w/ stock incan: 90% (transmission)

    Longbow Micra: 91+%

    F04 was fairly clean, but not perfect, sooooo.

    As usual, ymmv.

  10. #10
    Flashaholic
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    Default Re: Amount of light loss through Surefire F04 diffuser?

    so it's about 90%.....thanks guys

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