At 09:36 AM 5/16/00 -0700, Harold wrote: > Severely off topic, but I wanted to tap this group of > experts... I have >a client who is trying to send light from an incandescent lamp (about >250W) down a "light pipe." The light pipe appears to be like a fiber >optic pipe, but is a fairly large diameter and is, I believe, fluid >filled. > Attempts thus far have been based on using a lamp with a built in >reflector (a projector lamp) and putting lenses in front of it. I have a >feeling that a lot of light is still missing the pipe. > Is anyone aware of a "light capturer" that captures light from a > source >and sends it down a light pipe? 1. Focus the light from the lamp. 2. Add a collimating lens to generate parallel rays with the same aperture as the pipe. The light capture is dependent on effectiveness of the parabolic reflector and the capture aperture of the first (focusing) lens. You will also lose about 4% reflection at each lens boundary. ================================================================ Robert A. LaBudde, PhD, PAS, Dpl. ACAFS e-mail: ral@lcfltd.com Least Cost Formulations, Ltd. URL: http://lcfltd.com/ 824 Timberlake Drive Tel: 757-467-0954 Virginia Beach, VA 23464-3239 Fax: 757-467-2947 "Vere scire est per causas scire" ================================================================