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I agree it is a bright beast, essentially the bandwidth is the visible light spectrum and whatever can pass through the atmosphere in the infrared and ultraviolet. Ultraviolent would only pass through if there was a hole in the ozone above you but I think there is a very small amount that may come through.
You wouldn't need to worry about gamma and x-rays as these are blocked by our atmosphere so you wouldn't need to worry about exposure. I think gamma radiation would pass through the moon anyway x-rays would be the same.
As I use a 12" scope myself but I use Baader lenses I am able to attach a 2 inch double polarising filter in between the 2 and 1.25 inch adapter on the lens. I can now reduce the intensity of the moon to my eyes and I don't suffer from any of the over brightness issues after looking at the moon.
For a 12 inch scope I strongly recommend a double polarising filter if only just to save your dark adapted eyes.
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