Best regards,
Frank
The best design references I have come across are a couple of these
papers written by Dr. John Koshel and others -
1. R. J. Koshel, Anurag Gupta, Characterization of lightpipes for
efficient transfer of light, Proc. SPIE, Vol: 5942, pp. 594205, 2001.
2. A. Gupta, J. Lee, R. J. Koshel, Design of efficient lightpipes for
illumination by an analytical approach, Applied Optics, Vol: 40, pp.
3640-3648, 2001.
~Frank