A brighter projector (higher lumens) will help with image brightness but it does not help with color contrast or black levels. Since the projected image performance is important here, a contrast-enhancing material such as CineGrey 5D® is essential. White materials will reflect all of the light in the room; the projected light, indoor lighting, and sunlight through windows and doorways, everything. Because of this, the ambient lighting will still spoil image performance even with a bright projector. Ambient light rejecting (ALR) screens such as CineGrey 5D® filter out indirect light allowing your projected image to be what your audience will see instead of the extra glare. In addition to that, the screen’s filter layers enhance black levels and color contrast. This means that shadows, textures and slight variations in color shading in the projected image can be easily seen. Without an ALR material, such detail and clarity will not be visible. As you can see from the photos below, a bright projector does not enhance contrast.