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picture books

Discussion in 'Landscape Lighting' started by The Lighting Geek, Nov 6, 2010.

  1. The Lighting Geek

    The Lighting Geek LawnSite Senior Member
    Posts: 875

    If you would like to know about the picture books I spoke of in earlier posts, please PM me.
     
  2. ajslands

    ajslands LawnSite Silver Member
    Posts: 2,239

    I have a question, what is the measurement foot candles used for?
    Posted via Mobile Device
     
  3. The Lighting Geek

    The Lighting Geek LawnSite Senior Member
    Posts: 875

    It is the measurement of light that falls onto a surface. Typically it is used to maintain a standard of light for a particular task, such as a regulation tennis court or a kitchen task lighting. It is the amount of light in a 1 foot circle produced by a candle in the middle. That is how I understand it, I'm sure someone will correct me if I am wrong.

    In landscape lighting it would be the measurement of the light that lands on a sidewalk for example. It can be referenced as less than 1 foot candle as well, .5 FC.

    OSHA has standards for work spaces for things such as, offices 30 FC., hallways 5 FC, etc.
     
    Last edited: Nov 6, 2010
  4. ajslands

    ajslands LawnSite Silver Member
    Posts: 2,239

    How do you meassure how much light something produces?
    Posted via Mobile Device
     
  5. INTEGRA Bespoke Lighting

    INTEGRA Bespoke Lighting LawnSite Platinum Member
    Posts: 4,102

    You use a Light Meter. Or you refer to the IES photometry reports that come with most quality fixtures, lamps, etc.
     
  6. steveparrott

    steveparrott Sponsor
    Posts: 1,170

    Close, but it is the amount of light that falls on the interior surface of a 1 ft. radius sphere with a light source of 1 candela in the center. A more useful description is "the number of lumens that fall on one square foot of surface".

    For example, if you have a light source of 10 lumens and all the light were projected onto a surface of one square foot then you would have an illuminance of 10 foot candles.
     
  7. steveparrott

    steveparrott Sponsor
    Posts: 1,170

  8. The Lighting Geek

    The Lighting Geek LawnSite Senior Member
    Posts: 875

    Thanks Steve for that diagram, i'm sure it will help everyone better understand the terminology of lighting.
     

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