Not Ranked
As many as you can afford. I have 10 dbl 8 footers in a 50X30 ft work space, and it isn't enough. On cloudy days, or when it is getting dark I wish I had dble that.
__________________
20mph is not fast, unless you are doing it in a 3/2, 1000sq. ft. house on 10 ft. waves! 
|