4000K neutral white is the most widely recommended color temperature for office environments. It provides a clean, natural light that supports focus and productivity without the cold, clinical feel of 5000K+ or the drowsiness-inducing warmth of 3000K. For open-plan offices and workstations, 3500K-4000K paired with UGR ≤19 glare control creates a comfortable, high-performing workspace. Some modern offices use tunable white lighting (2700K-6500K) to support circadian rhythms, with cooler light in the morning and warmer light in the afternoon. Avoid 6500K in offices, as the blue-heavy spectrum can cause eye strain and disrupt sleep patterns after work.