When sourcing drones for light shows, the most critical factor is RTK-GPS (Real-Time Kinematic) positioning technology, which ensures centimeter-level accuracy for complex formations. You must also verify the LED brightness (measured in lumens) and color range (RGBW), as well as the battery flight time, which should typically be between 15 to 25 minutes to allow for takeoff, the show, and safe landing. Additionally, ensure the drones support redundant communication links to prevent signal interference during large-scale performances.