Here it is
(This particular paper seems to be concerned with accurately measuring the earth's albedo, and what the results mean for climate)
http://www.bbso.njit.edu/Research/EarthShine/espaper/earthshine_proposal.html
see figure 1 about halfway down. It shows (x5000) Earthshine intensity at approximately half of sunshine on the Moon, or about 10,000 times lower.
