A SF is 12"x12". If you put one 6" per SF it would be way too bright. You need to consider what type of light the recessed will be: incandescent, halogen, compact, or led. All are different and can give out more lumens than others. Also, consider your daylighting. Will you need as many lights as you think you do? Too many recessed can be overwhelming and too busy.
Here are some pictures to check out:
senior interior design student