Best Buy is listing a Govee RGBIC Floor Lamp for $79.99 in a Thursday deal roundup. The point is not the percentage-off badge; it is how much difference one controlled light source can make in an office without natural light.
A floor lamp with adjustable color and brightness can add a warm accent behind a desk or brighten an otherwise flat corner. It will not replace proper task lighting, and saturated RGB effects may look out of place in a professional office. Use restrained warm white or a subtle indirect glow.
Do this: check the exact model and current price, then consider whether a single lamp would improve the windowless office more than another wall decoration.