Cool, bluish light increases alertness and a sense of being on edge, which makes it work better for analytical, attention-heavy tasks. Warm, yellowish light creates a calmer, less tense atmosphere.
Writing something long or doing creative work feels less draining under warm light, while working with spreadsheets or numbers stays sharper under cool light.
If you work under one light all day, even switching it for a few minutes midday can give your mind a small sense of refresh.