1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

How to obtain beam spread angle of a parabolic reflector?

  1. Oct 21, 2013 #1
    Hi i am new to the forum and hopefully i can get some help.

    I am trying to design a small parabolic light reflector that can be used with an LED array as being the source of light. The diameter of the LED array is 18.75mm. I am trying to obtain equations that would relate the diameter and height of the reflector with the beam spread angle. This way i can change the dimensions of the reflector to affect the angle i want to achieve. As an example i want to achieve a total of 70 degrees beam spread with the source being 18.75mm and placed on the focus point of the reflector. How can i find the diameter and height of the reflector with this information? any help is appreciated. thanks
  2. jcsd
  3. Oct 22, 2013 #2

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor

    Nonimaging optics is practically it's own branch of science, essentially disconnected from everything else.


    This book (http://books.google.com/books?id=ykk1xQc25c0C&dq=Anidolic&source=gbs_navlinks_s) seems to be the primary resource in the field.

    You may find some useful information here:

    It sounds like what you are asking relates to the design of searchlights, so look around for work based on the Mangin-Chikolev equation. Good luck....
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook