Ok, the pass_through helped.
  It's just not very intuitive. If the light passes through transparent
objects, why not the photons? I think many people will be confused by this
feature.
  Of course adding pass_through to the box made the second light source to
send photons to the media too. I, however, found a temporary fix: Adding
looks_like { sphere { 0,.1 pigment { rgbt 1 } } }
to the light source has the same effect as
photons { reflection off refraction off }
should have.

  I made the container box a lot smaller and it looks a lot better now.
The reflected beams are denser and the sharp line is much less obvious now.
  The second image uses method 2. There's a strange non-lit line where there
was a sharp edge before (at the beginning of the first reflected beam). Also
the light reflected from the lens is almost gone.

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