When sourcing SMD LED displays, the Pixel Pitch (P) is the most critical factor; for indoor use, P1.2 to P2.5 is standard, while outdoor displays typically require P3 to P10. You must also verify the Brightness levels, measured in nits: indoor screens should offer 800-1,200 nits, whereas outdoor screens require >5,000 nits to remain visible under direct sunlight. Additionally, ensure the Refresh Rate is at least 1,920Hz (ideally 3,840Hz) to prevent flickering during camera filming or live broadcasts.