I actually run the 70W SON and 80W mercury vapor indoor and they are way too bright, the only discharge lamps I can comfortably use indoor is the 18W
and the 55W but in wall sconces. For the hps and mercury I don't use any fixture for them, just the E27 lamp base mounted on the ceiling, the ballast and its wires were just a few meters away and also exposed lol I actually enjoyed looking at them and don't mind it.
A 35W metal halide or a coated hps (I think Osram made them, powerball line) would be sweet, but I can't find any in my local store.