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Author Topic: white l.e.d.s as a light source John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 03-24-2003 01:04 PM                        Christopher Seo wrote: quote: What if the LEDs were engineered so that the R,G,B spectral emission peaks of the LEDs involved coincided with the spectral response peaks of the C,M,Y dyes in the film? You would get increased color saturation. But compared to the normally used continuous-spectrum xenon or carbon arc sources, they would have a different color rendering, which would be undesireable, unless every projector used a similar light source. And since the different film manufacturers don't all use the same "dye set", the color reproduction of different brands of film would shift relative to each other because they are not a "metameric match": http://www-staff.lboro.ac.uk/~huph/metamerism.htm http://www.wikipedia.org/wiki/Metamerism http://authors.elsevier.com/ArtworkInstructions.html?dc=AI11  |  IP: Logged Christopher Seo Jedi Master Film Handler Posts: 530 From: Los Angeles, CA Registered: Jun 99 posted 03-24-2003 04:51 PM                     Thanks John. Very interesting reading. Here's an interesting PerkinElmer link which explains a bit about the spectrum of xenon light. It wasn't written for projection lamps, but I assume the "continuous wave xenon" referred to is essentially the technology at work here. Figure 4 compares CW xenon to the solar spectrum, and it appears pretty close except for some narrow peaks in the larger wavelengths. PerkinElmer article  |  IP: Logged

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