Hi machead and welcome. If I understand your question correctly, your asking of the 2 1000 watters is enough light for your 12 x 8 space. Correct?
Assuming so; a 1000 watt light will provide adequate light to cover an area about 4 ½ ft. x 4 ½ ft of vegetative or flowering plants. So the answer to your question really depends some on how you wish to utilize your space.
I see that you are a relatively new poster here so I hope I'm not out of line to point you toward a wealth of information shared within this site. I am new to indoor growing and have found it tremendously helpful to explore the website starting with the section at the top titled "Grow Room — How to grow Marijuana". I have also benefited greatly from using the "Search" feature located under the "Forums" tab and found that many times the question I had on my mind had been addressed already by one or more of the very generous members of the community.