Macro Grow

So I was watching Drugs, Inc. and they had some guy saying he sold 10 pounds every two weeks and they showed guys with big grows in their basements in the inner city. Now lets say someone actually had enough space to grow this much every two weeks, how many plants/lights you think they'ed need? Like 10 pounds every harvest every two weeks. I'm guestimating that it would take a 1000 watt LED for each 2 pounds so 5 lights for every 2 weeks = 12*5 = 60 lights total all on different cycles (assuming 6 months for each harvest). Would this be an accurate estimate?

Now lets say something more realistic like 2 pounds every two weeks, would you say 1000 watt LED/HID with cooling system for each batch and 12*2 = 24. I'm curious because I'd be correct in assuming this is how dispensaries do it right?
 
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