VisionScienceList: Ideas for a bright diffuse light source

From: Anne Bjerre (Moopiab2@fs2.scg.man.ac.uk)
Date: Tue Jul 25 2000 - 06:51:35 PDT

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    Currently I am trying to develop a bright diffuse light source to
    measure pupillary responses.

    The light source needs to be controlled by a PC so light emitting
    diodes (LEDs) have been chosen. Unfortunately, ultra-bright LEDs
    are very directional, commonly with a view angle less than 10
    degrees, and I need a diffuse light source with a view angle of
    minimum 90-100 degrees.
    The intensity of the light source needs to be > 3000 cd /m2

    Several attempts have been tried with Ping-Pong Balls and plastic
    tubes of various lengths, but no succes as yet!

    Any ideas how to solve this problem?

    Yours sincerely

    Anne Bjerre, Ph.D.student

    E-mail: anne.bjerre@stud.man.ac.uk

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