CFL question

How many 28w CFLs I need in an area of 2.5ft x 1ft with 2-3 ladies? But I still want CFL amount that will be efficient vs HPS per watt

12 or so should give you a good grow but you would want to have some 42's or 55's for flowering maybe like 8-10 instead of the smaller bulbs. The higher lumens with the bigger bulbs will give you higher penetration into the foliage. 28ers dont reach very far into the plant. Remember: lumens dont add up so you can add all the 28's you want but they will still reach the same distance into the plant.

well 42s are expensive here.. and for the price of 10 42s or 55s I can get a 250 HPS from ebay.

I'm using 12 26 watt cfls. Seem to be doing good for me. and my space is 2x2x3.