There isn't a rule for video projections. Any released video projector is now capable of streaming from various devices. If you want a professional look, you may acquire a more expensive and advanced product with additional features but in an educational institute you can use any standard projector available. You may opt out for something that can deliver quality for a standard price because the input signal is all the same, the problem is with the output distance and focus. Please take a look on the Amazon sale list for various video projectors you can use and buy.