Your Lg 300 lumens portable projector is different technology, its DLP right? Led 86 is an LCD so maraming mga features sa Lg mo na wala dto sa Led 86, baka ma-disappoint ka lang. I've read about lg projectors have good color image. The only main advantage of Led 86 is bright and cheap for its performance.
Actually, I don't like watching movies in total darkness. I enjoying my projector with ambient lights, so you have to make some efforts to treat your room just like a home-theater.