It's been working for me so far. I did it because 4 of my clones started flowering early. I've never done it before.
I used a cheap clamp on reflector from Home Depot and a 23watt 6500k CFL over each plant. I stuck a long skinny board in the dirt to clamp the lights onto and put the whole thing on a cheap timer from Walmart. There are some pictures in my grow thread.