For USB powered ambient light cool mist humidifiers for nighttime use, useful comparison points include placement, dimensions, power method, capacity, controls and the specific functions represented by the search.
Catalog options relevant to this combination include USB Desktop Humidifier Night Light, USB Projection Humidifier Night Light, and Wood Grain Ultrasonic Mini Mist Humidifier. Their exact specifications can differ, so use the individual listings for final product details.