Thats exactly what I used, until I upgraded the 6500k's to florasuns. but you'll be really impressed with the short/stocky growth vs HID... in 6" square pots, you can get 12 under a 4x4' up to about 10-12" tall before they're crowded, 6 upto about 14-16"tall, or 4 upto maybe 18" tall.
thats...