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Amazon.com: Pyle 72" Outdoor Portable Matt White Theater TV Projector Screen w/ Triangle Stand - 72 inch, 16:9, 1.15 Gain Full HD Projection for Movie / Cinema / Video / Film Showing outside Home - PRJTPOTS71 : Electronics
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TaoTronics Projector Screen with Stand, TT-HP020 Indoor Outdoor Movie Projection Screen 4K HD 120" 4:3 with Wrinkle-Free Design (Easy to Clean, 1.1 Gain, 160° Viewing Angle & Includes a Carry Bag) -
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Light density factor, gain-factor: definition explanation illustration DIN 19045; screen perpendicular, indicatrix, radiation behaviour, measurement
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