This is a 10% reflection of a limited dynamic range image, with gamma correction enabled. Observe the sun. It rendered at RGB 89,89,89. Calculating (89 / 255) ^ 2.2 we find this is 10% of maximum brightness on a monitor - correct math and rendering equation, but it doesn't look the slightest bit real. That's becuase the sun's image was actually recorded at 1.0, not the correct value that is closer to 1000.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)