Shoot for at least 50watts per sq. ft.
So if your room is 2x2, that's 4 sq. ft, and you'll want at least 200 watts = 8x 25w CFL.
The 'daylight' bulbs give the most lumens per watt.
psteve Reviewed by psteve on . CFL's Are two 25 watt CFL's efficient enough life for only one plant in my closet? The one plant im movin indoors is only around 18 inches, i got it started late in the season so im gonna put it indoors. It can grow up to 6-7 nft. before it has to be cut, and has about 2 ft. across to grow. will these lights be sufficient enough for the whol process or will i need something a bit stronger for flowering? Rating: 5