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A diffraction grating would work best for capturing a larger beam of light.  You can get it in large plastic sheets from folks like Edmunds.  But if you are using something like a theater spot you will have to be careful about heat.  These new high intensity LED spot lights could be an alternative. 

If you want something very specific you could find a holographer and have a custom designed grating created. Holograms are just extremely complicated* diffraction gratings. It would allow you to design for a very specific set of angles and dispersion. You can also record multiple angles and make something that works better as the sun changes positions.

* Not complicated to make, just complicated in density of information recorded.

Erich

Erich Rose Design
807 The Living End
Austin, TX 78746
512-626-9930; [log in to unmask]

http://www.flickr.com/photos/erichrose/




On May 29, 2013, at 10:15 AM, Jeff Rosenblatt <[log in to unmask]> wrote:

> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
> *****************************************************************************
> 
> We want to diffract sunlight, or theater/stage white lights, into a nice rainbow pattern on the floor, from about 10-15' height above.
> 
> Does anybody know good supply sources for large prisms, or does a special diffraction gradient sheet work as well?
> 
> Thanks in advance for any feedback.
> 
> --Jeff--
> 
> Jeff Rosenblatt
> Director, Science City & Gottlieb Planetarium
> Kansas City's Science Center
> 
> Union Station Kansas City, Inc.
> 30 W. Pershing Rd.  Suite 400
> Kansas City, MO  64108
> Office:  816-460-2218
> [log in to unmask]<mailto:[log in to unmask]>
> 
> 
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