When playing with Smart Eco, even on the brightest scenes, there's virtually no detectable difference. But when your projector is idling, say when you pause a movie, or as when I have paused my DirecTV box, and there's just a small graphic, bouncing on the screen, the BenQ can go into lower power consumption modes. According to them, a drop of up to 70% from full power is doable when there's nothing seriously bright to project. Along with the lower power draw possible at times in Smart-Eco, BenQ claims an extra 1000 hours of lamp life - making it 6000 hours, in Smart Eco, compared to standard Eco mode. I assume that depends on usage. If you are watching nothing but bright sporting events, I would suspect lamp life would be close to standard mode.