Obviously, the HPS will have a more efficient lumen/watt ratio... which will give you the best yield for the most value. CFL's will run cooler... potentially cost much less... but won't pack on the buds like HPS.

If you can manage the heat and space requirements needed for an HPS... go for it. If it is even a question... go for the CFL's, especially if you are low on cash.

CFL's work pretty damn good if you plan ahead and train the plant.

Here is some bagseed... day 28 flower... about 12,000 lumens of soft white CFL's (looks like the 6500k bulbs, but it's just the camera) Don't worry about that yellowing It tends to happen when humans try to play mother nature :hippy: