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Here is the difference in color between a 10,000 Kelvin Ushio bulb and a regular metal halide of around 4200 Kelvin

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<a href="https://mail.3reef.com/gallery/photos/10k-ushio-and-4k-sylvania.731/" title="10K ushio and 4k Sylvania by Diver_1298, on 3reef Aquarium Forums"><img src="https://mail.3reef.com/data/photos/l/0/731-1131641529-3dd54b97f260f9242571c9beab748012.jpg" alt="10K ushio and 4k Sylvania" /></a>

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[URL=https://mail.3reef.com/gallery/photos/10k-ushio-and-4k-sylvania.731/][IMG]https://mail.3reef.com/data/photos/l/0/731-1131641529-3dd54b97f260f9242571c9beab748012.jpg[/IMG][/URL] [URL=https://mail.3reef.com/gallery/photos/10k-ushio-and-4k-sylvania.731/]10K ushio and 4k Sylvania[/URL] by [URL=https://mail.3reef.com/gallery/authors/diver_1298.8718/]Diver_1298[/URL] on 3reef Aquarium Forums