If it's only putting out 830 lumin then it has got to be a 60 watt incandescent equivalent, meaning it's actually probably about a 14 watt cfl. That's not even enough to grow 1 plant, unless you only want to harvest a gram or two off of it. You will need to get at least one 26 watt cfl per plant (100 watt incandescent equivalent). This will still leave you on the extreme 'low end' of what you will ultimately need. Shoot for 2500-3000 lumin per square foot for a decent yield.
Also, move the light closer. With cfls you should put them about 2 inches above the plants. Obviously, you can't do that to six plants with only one cfl.-P