When sourcing mini projectors, you must distinguish between Native Resolution and supported resolution; true 1080p native resolution commands a higher price than 720p or 480p models. Brightness, measured in ANSI Lumens, is the most critical cost driver—ensure the supplier provides ANSI ratings rather than 'Marketing Lumens' to guarantee visibility. Additionally, evaluate the Light Source Life, typically aiming for LED lamps with 30,000+ hours, and the Contrast Ratio (e.g., 2000:1 or higher) for image depth.