High Bay Luminaires that are HID -
I know that it is allowable to wire these using a receptacle provided it is directly above the fixture and the cord is exposed outside of the fixture.
BUT...
I am being told that these HID High bays MUST be wired using the receptacle method. We are no longer allowed to just hang the fixture from the 4 square box using a swivel plate and wiring directly into the fixture.

Is this correct? I was looking through the code but thought one of you smart fellows would know off hand and save me the search. ( yeah I'm being a bit lazy)