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:
TheMetal1 Reviewed by TheMetal1 on . HPS vs CFL Light Question NEED ADVICE!!! I am currently growing two plants with 6 23w CFLs. Both plants are about 6 weeks old, and they are looking amazing. I know that the flowering stage is coming up pretty soon, and im kinda low on cash. I know that HPS can get pretty pricey. So my question is, would it be a bad decision to flower the plants with the CFLs? What kind of yeild can i except with the 6 CFLs vs HPS. Also if i really should get HPS what wattage do you guys recomend for a 3.5ft x 3.5ft x 3.5ft plastic grow box lined with Rating: 5