How many lumens do I need for my event?
Planning and Practical Considerations
Lumen requirements depend on three factors: screen size, ambient light, and content type. Larger screens need more lumens to maintain brightness across the surface. Brighter rooms (trade show floors, ballrooms with house lights up, outdoor daytime) require dramatically more output than dark rooms (concert stages, theatres, darkened conference rooms).
As a rough starting point: a small breakout room with a 10-foot screen in controlled lighting might need 5,000-10,000 lumens. A general session in a ballroom with a 20-foot screen typically calls for 15,000-30,000 lumens. Large-format event production (wide blends, high ambient light) can require 30,000+ lumens per projector. For reference, 4Wall's production of Mary Poppins at Drury Lane Theatre used five Epson Pro L1505U projectors totaling 60,000 lumens across multiple projection surfaces.
When in doubt, more lumens gives you headroom. A projector can always be dimmed down, but it can't be pushed past its maximum output.
Read more about projectors in our Comprehensive Guide to Projectors article.