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The projector is good, but not great. With a brightness rating of just 15 lumens, it needs quite dark conditions to deliver images you can actually see. The average office will be too brightly lit.
The further you move the device away from the projecting surface the larger and dimmer the image becomes. Samsung says the Galaxy Beam can handle about 2 metres, at which distance you'll get an image measuring 50in. across the diagonal. We found it was just about viable to about 3m and 60in., but you won't want to go further than that.