i've got a 30 x 60 inch tent to flower in and i use a 400 watt hps on one side of it and a 200 actual watt led on the other side and thats about perfect coverage, the led saves on heat and electricity, but it cost me twice what the hps did, and its still the bottom of what i consider acceptable.
just running one 400 watt hps in that space keeps it between 80-84 with the lights on, with a 6 inch 240 cfm inline fan running at 75%, so heat can be a real issue, a 1k hps puts off a lot more heat than a 400