The above Ad will no longer appear after you Sign Up for Free!

beam spread

Discussion in 'Lighting and Electrics' started by propmonkey, Apr 28, 2005.

  1. propmonkey

    propmonkey Well-Known Member

    Messages:
    990
    Likes Received:
    3
    Location:
    Beloit/Milwaukee, WI
    quick question, im want to make a beam spread chart of the instruments we have. is this the correct way to find it?

    tan([beam spread angle]) x [height/distance] = the beam pool??
     
  2. zac850

    zac850 Well-Known Member

    Messages:
    1,299
    Likes Received:
    24
    Location:
    New York
    I don't believe so. I think you need half the beam spread angle, so that it is a right angle for the beam... but let me check.

    The program I use to do this math for me (LD calculator lite, it was free from somewhere, maybe ask google) says that the equation for beam width is:

    X= D * (2 * Tan (F/2))

    Where D is the distance the light travels and F is the beam angle.
     
  3. BNBSound

    BNBSound Active Member

    Messages:
    229
    Likes Received:
    16
    Location:
    Alexander, NY
    You can get Lumie Light to run on a Palm device, the Photometrics Guidebook is $13 invested very well too.
     
  4. len

    len Well-Known Member

    Messages:
    2,709
    Likes Received:
    204
    Location:
    Chicagoland
  5. propmonkey

    propmonkey Well-Known Member

    Messages:
    990
    Likes Received:
    3
    Location:
    Beloit/Milwaukee, WI
    i have the calculator thing on this comp. when iwas trying to figure it out i was at school.

    i was thinking using half angle is the instrument was perpendiclur to the object or fall. in this case it would be at 45 degrees.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice