As someone who has forgone any TV's in place of a pretty heavy duty projector in my living room, I can say with some certainty that 15 lumens will barely be visible even in a pitch black room! My full-size/spec projector puts out about 2500 lumens and is still hard to see with the curtains open in the day time!

I view this in the same way I view "fun-size" candy bars...an interesting novelty for kids, completely impractical for most everyone else!