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Low Earth Orbit
Lighting & Electrical
Immersive Video Projection Melding with Event Decor Lighting
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<blockquote data-quote="Rob Timmerman" data-source="post: 49325" data-attributes="member: 172"><p>Re: Immersive Video Projection Melding with Event Decor Lighting</p><p></p><p></p><p></p><p>The bigger issue isn't matching CCT, but matching how a specific multicolored object is rendered by a particular light source. CCT (and du'v') can be pretty easily corrected with filters, but getting the full spectrum to match is much harder. Fun experiment that illustrates this at a logical extreme: Take your favorite "white light" source and shine it on a matte white surface. Now take an RGB fixture and shine it on the same surface, next to the white light source. Adjust the RGB values until the 2 lights match. Now, take a multicolored object and place it in the beams of these two fixtures. Note how it looks completely different in the 2 different light sources.</p><p></p><p>Filtration tends to work best when the spectra in question are continuous. So filtered incandescent and arc sources can match daylight pretty well (and vice versa), but metal halide, fluorescent, and LED sources don't do quite so well because of the peaks in the spectra (blue in the case of LED, multiple peaks for MH and fluorescent, depending on the phosphor and halide mixes). In theory, these peaks can also be eliminated with filters, but in practice that's very inefficient and hard to accomplish. Mixing multiple source types helps, and the eye is pretty forgiving compared to video. Deliberately contrasting sources also tends to help hide the differences.</p></blockquote><p></p>
[QUOTE="Rob Timmerman, post: 49325, member: 172"] Re: Immersive Video Projection Melding with Event Decor Lighting The bigger issue isn't matching CCT, but matching how a specific multicolored object is rendered by a particular light source. CCT (and du'v') can be pretty easily corrected with filters, but getting the full spectrum to match is much harder. Fun experiment that illustrates this at a logical extreme: Take your favorite "white light" source and shine it on a matte white surface. Now take an RGB fixture and shine it on the same surface, next to the white light source. Adjust the RGB values until the 2 lights match. Now, take a multicolored object and place it in the beams of these two fixtures. Note how it looks completely different in the 2 different light sources. Filtration tends to work best when the spectra in question are continuous. So filtered incandescent and arc sources can match daylight pretty well (and vice versa), but metal halide, fluorescent, and LED sources don't do quite so well because of the peaks in the spectra (blue in the case of LED, multiple peaks for MH and fluorescent, depending on the phosphor and halide mixes). In theory, these peaks can also be eliminated with filters, but in practice that's very inefficient and hard to accomplish. Mixing multiple source types helps, and the eye is pretty forgiving compared to video. Deliberately contrasting sources also tends to help hide the differences. [/QUOTE]
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Immersive Video Projection Melding with Event Decor Lighting
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