If you calibrate in the Living color mode and allow some extra brightness for lamp aging, you will need a modest 1.2 to 1.3 gain. If you want to use one of the Cinema modes, you will need about twice as much gain. The latter would require a retroreflective screen such as the Da-Lite High Power, along with a seating position close to the projector lens. These numbers are based on the lumen values given in this review.
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