hey i have 48in 40wt universal fluorescent light bulbs and theres 2 in one ficture, i have 2 fictures = 4 bulbs. each bulb puts out 3150 lumens, 4100k and 41sp. im planning on getting plant lights for fluorescent fictures but i want to make sure i get the right ones and how manny i should have in my 3.9 sq ft room.