light woods and LOS

[t1M0t8yk]

  I have questions about the LOS rules for light woods.  Is my understanding of the following correct?

1)  For units at the same elevation two light woods always block LOS; i.e., the light woods hexes need not be adjacent.

2)  For units at different elevations two light woods block LOS only if they are both at the same or higher elevation as the higher unit.

Please advise if there are other considerations that I have perhaps not perceived regarding light woods and LOS.