Lower numbers indicate a warmer color temperature. I run my monitor at 6,500K and split the difference. Just don't worry about it. The pictures would probably look different even if we had our two monitors side by side set to the same color temperature, given the tremendous amount of variation from monitor to monitor, even among the exact same brand and model. The human eye is very good at adapting to differences in color temperature.
Most fluorescent lights are very green.
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