Laser writing on the moon

On Apr 1, 3:05 pm, Mike Ross
wrote:
I thought I saw recently somewhere a plan to use a laser to put ads on the
moon. Is that really possible? Seems like the power levels required would
be prohibitive, or at least dangerous to anything passing through the beam.

Should some group decide to such a thing, I wonder how hard it would be to
find the source of the laser?
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Mike Ross, PE * 20+ yrs at JSC in Shuttle & ISS robotics
Opinions expressed herein would probably appall NASA
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A sufficient battery or array of green power lasers in the commercial
range of several watts each, as such could rather easily make a
sustained 100 km diameter spot of dim illumination on the physically
dark lunar surface visible to the naked human eye, although red lasers
would actually reflect more efficiently. Laser tracking would be most
difficult for the majority of the public amateurs, but not
insurmountable considering the quality of telescope tracking that's
commercially available.

Using 1/10 second pulsed laser shots at much greater intensity would
be more doable. Using such a 100 ms pulse every 10 seconds would
yield the better results with 100X as much beam energy per photon
torpedo like sots, that if given good enough tracking per amateur
could create as tight as a 10 km diameter worth of laser illuminated
area.
.. - Brad Guth