I'm looking into different surfaces for use as a projector screen. One of the most highly-regarded screen surfaces is the Stewart StudioTek 100 (http://www.stewartfilmscreen.com/residential/materials/front_projection_screen_materials/studiotek_100/studiotek_100_residential.html [Broken]). In a comparison test… http://www.projectorcentral.com/paint_perfect_screen_$100.htm?page=Finding-the-Perfect-Paint … a certain type of paint exceeded the performance of the StudioTek 100. The article states: Setting up the test board with the ProClassic Smooth Enamel Satin against the Studiotek 100, we discovered that we had not only arrived at our objective, but surpassed it. Color balance was dead on, just as with the Duration. But this paint actually delivered a slightly brighter image with deeper blacks. With a checkerboard test pattern, the black and white squares that fell on the test board were visibly higher in contrast than those that fell on the screen. A spot meter confirmed what we could already see -- white highlights were brighter by about 10%, and blacks were blacker by about 10%. What intrigues me is the last sentence. Let's assume the two screens are tested separately in a dark room (no wall reflections) with identical light falling upon them. I can understand why one of the screens might be brighter than the other for highlights ("white highlights were brighter by about 10%"), but I can't work out why that brighter screen becomes dimmer ("blacks were blacker by about 10%") when the lighting is reduced. What might be the physics behind that phenomenon? If it is not physically possible, one explanation might be that the screens were tested side-by-side in a non-darkened room, and reflections from the walls back to the screens caused inaccurate light readings at the darker levels. An off-topic question: how come the projectorcentral link above is not accepted as a link by this website?