However, If your father is planning on 3D viewing, the 120 may be too much screen for the projector. For 3D, 100 inches seems to be the practical limit.
If your looking for projector in a bright situation
I would go with the HD25-LV
I was in the same situation as you a few months ago with have a full wall of windows one side
Choose the Optoma won't regret it a bit!!
I can't say that isn't true but if your setting it up spend 10-20 minutes to get it perfect and your set.
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