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Originally Posted by Steve McVoy
The other problem is the dispersion angle. The light source has to have a wide enough beam to illuminate all 45 lenses in the disk, which is located about 2 inches from the source. The distance from the outermost lens to the innermost one on the disk is about 1/2 inch, so you need about a 15 degree beam width. Without this requirement, a laser of some sort might work.
There must be some way to use a condensing lens arrangement to reduce the size of the spot from a high power LED, but I don't know enough about optics to do it. If anyone has any ideas, I'd like to hear them.
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Without major modifications to all the optics including the lenses on the disc, I'd guess it can't be done - the system essentially projects the image of the crater as a spot on the screen, I believe, and has a fixed magnification, so increasing the size of the source necessarily increases the size of the spot.