you might be able to get away with a geissmann 13500k but I don't think they come in 175w mogul. I would recommend sticking with the 10000k..do you know what brand you're using now? There are some nice 10000k bulbs out there (ushio, sun aquatics, aqualine bushke, xm)
like stated above, you lose a lot of par for "prettiness" of a 14k bulb..some are even worse than 20000k bulbs
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