In comparing light bulbs based on their color temperature, how much difference in color temperature is needed before an average person can notice that difference?
It would depend on the viewing conditions. For example, if the two bulbs were viewed side-by-side, then a smaller difference would be perceptible than if the bulbs were viewed one at a time. However in general, it is probably reasonable to assume that a difference of about 100K or greater is perceptible. (The actual value will also depend on the initial color temperature as well with the change required to see a difference becoming larger at higher color temperatures.
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