Do stratus clouds or cumulus clouds reflect more UV radiation?

Stratus clouds reflect more of uv radiation, the reason being two fold. Uv radiation increases with increasing altitude and decreasing cloud cover. read more

Stratus clouds reflect more of uv radiation, the reason being two fold. Uv radiation increases with increasing altitude and decreasing cloud cover. As you probably know Cumulus clouds, being low-stage clouds, are generally less than 2,000 metres (6,600 ft) in altitude unless they are the more vertical cumulus congestus form. read more

Interested in this since I sometimes look down on the clouds in the plane, and wonder if some of the reflected UV-A radiation might damage my eyes. read more