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Hello – 3500 Kelvin is most common in restaurants and homes and looks the most like old-style incandescent light (yellowish). 4000 Kelvin color is what is found in fluorescent lighting. It will look more white than 3500 K, and often also a little pink. 5000 Kelvin light is more bluish, often compared to the light from the sun outside at noon. It has been shown to be the best for seeing fine details. 5000 Kelvin color light is also used to treat Seasonal Affective Disorder, or the Winter Blues, when people get depressed from not getting enough sunlight (Alaska, Sweden,etc…)