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Thread: Foot candle to aperture and ISO.

  1. #21

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    Re: Foot candle to aperture and ISO.

    Quote Originally Posted by r.e. View Post
    One consequence of the widespread use of LED lights for cinematography and still photography, and the abandonment of tungsten, is that watts are no longer a reliable indicator of light output. In my view, this makes understanding Lux essential to evaluating light sources. Foot candles is a U.S. thing that I suspect is used less and less frequently. When I'm purchasing or using artificial lights, I want to know Lux, not watts (except to determine how much energy the fixture/light draws) or foot candles.
    A new LED technology rated in brightness, or lumens as most are now, will be introduced on Dec. 9th that could be a game-changer, and not just for lighting.

    https://ecat.com/

  2. #22

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    Re: Foot candle to aperture and ISO.

    Quote Originally Posted by Neal Chaves View Post
    A new LED technology rated in brightness, or lumens as most are now, will be introduced on Dec. 9th that could be a game-changer, and not just for lighting.

    https://ecat.com/
    See this Wikipedia article on that company's cold fusion claims: https://en.wikipedia.org/wiki/Energy_Catalyzer

    This is the Wikipedia article on CEO Andrea Rossi: https://en.wikipedia.org/wiki/Andrea...(entrepreneur)

  3. #23
    C. D. Keth's Avatar
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    Re: Foot candle to aperture and ISO.

    Quote Originally Posted by r.e. View Post
    One consequence of the widespread use of LED lights for cinematography and still photography, and the abandonment of tungsten, is that watts are no longer a reliable indicator of light output. In my view, this makes understanding Lux essential to evaluating light sources. Foot candles is a U.S. thing that I suspect is used less and less frequently. When I'm purchasing or using artificial lights, I want to know Lux, not watts (except to determine how much energy the fixture/light draws) or foot candles.
    Footcandles are still used frequently when lighting sets for films and TV.
    -Chris

  4. #24

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    Re: Foot candle to aperture and ISO.

    Quote Originally Posted by r.e. View Post
    One consequence of the widespread use of LED lights for cinematography and still photography, and the abandonment of tungsten, is that watts are no longer a reliable indicator of light output. In my view, this makes understanding Lux essential to evaluating light sources. Foot candles is a U.S. thing that I suspect is used less and less frequently.
    Most likely true.

    When I'm purchasing or using artificial lights, I want to know Lux, not watts (except to determine how much energy the fixture/light draws) or foot candles.
    Foot candles measure the same thing as lux - they're both surface brightness. 1 foot candle = 1 lumen per square foot, and 1 lux = 1 lumen per square meter. So one foot candle is about 10.8 lux, or about a factor of 10 to the accuracy needed for general photography.

  5. #25
    Drew Wiley
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    Re: Foot candle to aperture and ISO.

    All this new E-lighting is ruinous for my eyes. Most of these are sheer junk bulbs anyway, very deceptively rated for both color characteristics and bulb longevity. To hell with it. So I just dropped some bucks and ordered up some of the real deal architectural-quality 5000K LED floods from Waveform Lighting for my old studio area display wall at about $30 per bulb. Completely different story - did what was advertised, and best of all, no more eyestrain. Guess I should grab my ole lux meter and see what it says, just out of curiosity.

  6. #26

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    Re: Foot candle to aperture and ISO.

    Zero Point Energy is not cold fusion and Wikipedia is not a reliable source for information. Here is Dan Winter presenting some of the new technology.

    https://www.youtube.com/watch?v=pHj8PP4XBp8

  7. #27
    Tin Can's Avatar
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    Re: Foot candle to aperture and ISO.

    Nobody knows yet

    There must be many things we all don't know

    Quote Originally Posted by Neal Chaves View Post
    Zero Point Energy is not cold fusion and Wikipedia is not a reliable source for information. Here is Dan Winter presenting some of the new technology.

    https://www.youtube.com/watch?v=pHj8PP4XBp8

  8. #28

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    Re: Foot candle to aperture and ISO.

    Quote Originally Posted by Neal Chaves View Post
    Zero Point Energy is not cold fusion and Wikipedia is not a reliable source for information. Here is Dan Winter presenting some of the new technology.

    https://www.youtube.com/watch?v=pHj8PP4XBp8

    It's fine that you're a believer, but neither your post #21 nor your link reveal the history of Mr. Rossi and his company. To put it mildly, there are reservations about Mr. Rossi's claims over the years. People should read the Wikipedia links in post #22 before they get on this particular bandwagon and fork over money, as they are invited to do in your link. Apparently you don't like what the Wikipedia articles say. A search will pull up many sources.
    Last edited by r.e.; 1-Dec-2021 at 05:47.

  9. #29
    Tin Can's Avatar
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    Re: Foot candle to aperture and ISO.

    I read

    I hope

    I gave no $$$

    Science Fiction sometimes comes true

    I am a Dreamer, where my real life is, I have wonderful imagination

  10. #30

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    Re: Foot candle to aperture and ISO.

    Quote Originally Posted by r.e. View Post
    It's fine that you're believer
    Faith and belief have nothing to offer science which could be at the service of the biosphere rather than the self-destructive folly that prevails now.

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