Room Light: Bright rooms need 3000+ lumens; dim rooms, 1500–2500.Ambient Light: More light and higher lumens for clear visuals.Screen Size: With bigger screens, there is a need for more brightness (2500+ lumens).Projector Type: If your projector is Laser, it will be brighter; if it is LED, it will save energy.Best Range: 2000–3500 lumens suits most smart projectors for the home. For more information: https://www.lg.com/in/projectors/