The larger the projection is the more spread out your light is (even in a pitch black room). You don't want to mess with anything under 1200 ANSI lumens preferable 2000+.
I think you're mixing up terms and concepts. Traditional projector bulbs are UHP mercury arc lamps which are extremely hot. Nothing to do with DLP or LCD. LCD or DLP are the engines that are lit by the bulbs, not the bulbs themselves. LED projector bulbs are a whole different animal than UHP projector bulbs.
LED bulbs typically never achieve over 300 ANSI lumens and on the rare occasion 500. Until technology has caught up and can give a 1200 ANSI lumen LED bulb, you really don't want it. LED bulbs have wonderful lifespan, but horrible lumens. Your eyes can adjust to the low lumens but your room is going to need to be 100% pitch black.
My first projector in 2006 was 300 lumens and I hated it. I cursed the money I wasted on it. I suppose I could give you a side-by-side comparison of 300 lumens vs 2500 lumens. I have my old projector in the basement somewhere.