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The ideal color temperature for humans to view images is 5000K. This is the wavelength that allows our eyes to see clearly with the lowest quantity of light. Some call this a warm white. When using lighting fixtures producing light at this wavelength, there is a significant reduction in electrical usage. So wise architects and environmental designers have been doing this for years. By setting your displays color temperature to 5000K, you can reduce eye strain, and forget Apple's app. Just leave it at 5000K if you want maximum visual acuity. If you want the "daylight to dusk" effect, there are apps that do this better than Apple's. One of them is f.lux. It adjusts the color temperature of your display in accordance with the suns position automatically. The color temperature is adjustable, as well. There is also a defeat function that allows you to to view images at 6500K for color matching work for one hour at a time, if you wish. The notion that Apple discovered something new, or that their misguided app will help you is laughable.