Diolma, yes to see the full range of a high dynamic range would be impossible, as there can be an infinite range of light, which no display can reproduce. Current displays have a brightness of no more than 300 cd/m2 and a black of no less than 0.5 cd/m2. for the contrast ratio, divide the brightness by the blackness, so you get 600:1 for high end displays. In the real world, the sun is considered to be about 10,000 foot-candles on a bright day. Converted to the same measurements, a high-end display today only outputs 27 foot-candles. A dark alley is probably around four foot-candles. Therefore, there needs to be an effective contrast ratio of at least 2500:1 to display just the relative intensity of each area. That also means that there needs to be at least 2500 values from black to white in order to display the range of illumination between the sunlight and shade. Current 8-bit displays can only represent 255 gradations, so on a high-dynamic range image containing such data, 90% of it will not be dispalyed. BUT, just because you can't see it doesn't mean it can't work for you. 3D software (not bryce, but maybe version 6 eh?) can read the intensities in the HDR file an use that to illuminate a scene according to real world illumination scales. Granted, your render will inevitably be low dynamic range, because they are being rendered in 8-bit. But since all other things have limited dynamic ranges as well, either digital photos or film, the image will appear more realistic.