Seems like 500 lumens on 100" outside is going to be problematic, even at night. Might work if you're isolated enough and have very little light pollution... But there are options that might work better in very similar price range. With that particular model, you're paying a premium for the LED bulb. Which is nice, you never have to replace a bulb... but with traditional bulbs going into the 5000-6000 hour ranges now, I don't know that the additional expense is justified. If you're open to alternatives, the acer H5370BD is 2500 lumens and that's at 5,000 hours bulb like (6,000 hours in eco, which still has 2,000 lumens).
Going to take more than that to make the screen watchable in outside daylight, of course, but that kind of output will make it look good at night, where 500 might struggle a bit.
On the other hand, if you really want the added long term reliability of the LED bulb, this LG looks like a pretty good option (though I've not seen reviews for that specific model).