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A reasonable setting even for very bright materials would be around 225-230. For example, the Reflectance value of a white piece of paper, when converted to RGB, is around 225. Please note that this only matters for the Reflectance 0° color. The Reflectance 90° color can be left at fully white (RGB 255).
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Left: unnaturally high Reflectance 0° at 255 results in loss of contrast, unrealistic shading and slightly more noise.
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Right: correct Reflectance 0° set at 225
Layers in Additive mode
In the Maxwell material system, you can stack Layers on top of each other in either Normal or Additive blending mode. Special care needs to be taken when using the Additive blending mode, as there is not a typical normalization of material reflectance as in Normal blending mode. Please keep the following points in mind when building a material with Layers set to Additive blending:
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