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Thread: Lumens

  1. #1
    Join Date
    Sep 2004
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    2,986

    Post Lumens

    Does anyone know the differance from Lumens Candlepower Foot Candles and MCD s. I am trying to figure out how to accurately figure out which flashlight is better brighter than its competetors. Quite confusing for me at least. Thanx

  2. #2
    Join Date
    Jan 2004
    Location
    Taftville CT
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    Post

    I have a hand book of reference tables that has some lumens formulas in it. No lighting engineer. I do not know exactly what you are looking for, how many of this = that, or this in comparison to that. I do not know what an "MCD" is either, except for the "golden arches".
    Paying Attention Is Not That Expensive.

  3. #3
    Join Date
    Mar 2001
    Location
    Nottingham, England
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    15,247

    Post

    1 foot candle = 10.76391 meter-candles
    .

    Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.




  4. #4
    Join Date
    Jan 2003
    Posts
    235

    Cool

    Take the flashlights and shine them into your eye, the one that blinds you the best is the one to buy. Smitty
    Smitty.... Ride Hard, Die Fast

  5. #5

    Lightbulb

    Smitty...

    Is that what they call a "blind comparison"?
    \"But the Junkyard IS my storage area, Honey!\"

  6. #6
    Join Date
    Jun 2002
    Posts
    601

    Post

    Try searchin on the interney "Lumans to Candles", etc. There are plenty of those conversion engines available.

    Marv

  7. #7
    Join Date
    Aug 2003
    Location
    Nazareth, PA
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    Post

    madman,

    what you ask cannot be done. on several of the message boards and newsgroups i've been on over the years this topic comes up quite frequently. the last million-reply thread on it was on the rec.guns newsgroup when guys were trying to decide which tactical flashlight to purchase.

    the problem is that a candlepower is a unit of measurement describing the light output from a point source based on an archaic standard of "one candle power". a lumen is the measurement of a light's intensity over a given area. a flashlight of 1000 candlepower will have a different lumen value depending upon how far away from the light source the measurement is taken. think of it this way, if you are 1" from a light, it is very bright, if you are 10' from it, the light cast on to a surface (the lumen value) is much less, but the candlepower of the source has not changed.

    andy b.
    The danger is not that computers will come to think like men - but that men will come to think like computers. - some guy on another forum not dedicated to machining

  8. #8
    Join Date
    Mar 2003
    Location
    South Central Tennessee
    Posts
    269

    Post

    According to my "Pocket Reference":

    To convert from candle power to lumens you multiply by 12.566

    I know this is what we use at work when we calibrate light meters.

    Hal C. , www.tempyramid.com
    No matter where you go, there you are!

    Hal C. , www.teampyramid.com

  9. #9
    Join Date
    Sep 2004
    Posts
    2,986

    Post

    Hey Smitty Ill just take youre advice but Ill shine the light in someone elses eyes. II ll probably use one of the kids.

  10. #10

    Post

    here is the free conversion program that I use http://www.joshmadison.com/software/convert/
    John

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