question in Building Construction Illustrated (3)

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    Hang Cho

    beam spread differently as the angle of light beam change. (ex. short angle correspond to cont. line)

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    Yanrong Gao

    Hi Hang,

    Thanks for your message. But my question still didn't get answer about the curve lines? Sorry!

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    Hang Cho

    each curves indicate the area the light beam can reaches.

    see attached (page 19)

    https://www.ncarb.org/sites/default/files/BS_Exam_Guide.pdf

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    Rebekka O'Melia

    I dont have that book in front of me. But think of that as a section, with the light source being at the center.

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    Hang Cho

    each line (dotted vs continuous) relate to light fixture spacing. (see attachment 1 & 2)

    attachment 1 - building construction illustrated

    attachment 2 - MEEB (ch. 16.6)

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    Rebekka O'Melia

    The dotted outline is typically the light distribution of the sides, so this fixture doesn't throw light symmetrically. And this fixture's light is mostly going down. (There's just 2 tiny shapes above the horizontal) The spacing ÷ mounting height ratio shows that the higher the fixture is, the less light you'll get from it.  Makes sense, right??

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    Hang Cho

    Yes, you are right! (as this ratio shows.)

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