The way a surface refracts light is what differentiates one screen fabric from another. Look at the gain together with the viewing angle when evaluating fabric choices. Lower gain ratings mean the light is reflected more uniformly from the center to the edge of the viewing area. Here are how the most popular fabrics stack up. Matte White The most versatile screen surface and a good choice when you can control ambient light. It evenly distributes light over a wide viewing area (50 degrees), while colors remain bright and life-like, with no shifts in hue. This surface may be cleaned, is mildew resistant, and flame retardant. Gain = 1.1 viewing angle = 50 degrees High Power combines the high reflectivity of a glass-beaded surface with the ability to clean it when required. Its smooth surface offers the highest gain of all types of screen surfaces with moderate viewing angle (25 degrees). Choose this surface if the image will be competing with ambient light. Mildew resistant, flame retardant. Gain = 2.8 viewing angle = 25 degrees Video Spectra 1.5 especially designed for demanding video and overhead LCD projection applications where a balance of higher gain (1.5) and greater viewing angle (35 degrees) is required. The special pearlescent surface may be cleaned with mild soap and water. Mildew resistant, flame retardant. Gain = 1.5 viewing angle = 35 degrees Glass Beaded This surface achieves a higher gain by reflecting more of the projected image back along the projection axis. The glass beads provide the additional reflectance and reproduce vibrant life-like color at moderate viewing angles. Gain = 2.5 viewing angle = 30 degrees