Snow does reflect a lot of light, but not nearly to the degree that a mirror will. I don't know the real numbers, but let's say the snow reflects 15% of the sun's light. A mirror reflects 95%. Those aren't real numbers; I'm trying to illustrate the point that a mirror is vastly more efficient at reflecting the sun.
Well put Jim. Sure, snow and ice are "bright" compared to trees in the overall amount of light they reflect, but it's nothing like the pinpoint flash of a mirror. Tjin, I would keep the mirror and look elsewhere for weight savings. And believe me, I am a "cut all the weight you can" kinda guy.
A reasonable compromise is to go with a proven, high quality plastic mirror like the ones from Adventure Medical or Rescue Reflectors. The glass mirrors are certainly brighter but the weight difference is real.
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