I hope so!

Thank you, realistically around 50 to 65 in is going to be the best for this type of projector. Of course as you go larger it's going to become a little bit less clear, sharpness, detail etc. decline.. Tthe ideal situation would be to have a really good background usually gray backgrounds are recommended a lot of times over white backgrounds and you're going to want to have of course a room or a place that is absolutely dark to get the best outcome.

I think so but best to check the link for more information, I'm in the hospital right now so I can't check, sorry.

It has HDMI though I am not sure how well it would keep up for gaming, it might do fine but I'm no gamer so I have nothing really to test that aspect of it with, sorry. The product listing shows consoles as being an option which suggests it'll work but how well is questionable. Image is here: m.media-amazon.com/images/I/718fieLerCL._AC_SL1500_.jpg There are Q&A and reviews that suggest it will but might be laggy so I'd say yes but not with the faster paced games so much. If I wanted to game 300 inches sounds like it'd be really fun though!

Lux and lumens are not the same how many lumens is this? 18000lux how many is that in lumens?

I'm in the hospital, you'll have to check the link below the video for more information.