Has anybody ever used lighting under their canopy?

[Enigma14]

I have read a decent amount of the grow threads here at 420mag, but I haven't seen (or maybe just didnt notice) anybody who used extra lighting below their plants canopies. I've been thinking that a couple low heat cfl's or something below the canopy would greatly help buds lower down on the plant to grow, and thus increase a plants overall yeild.

I'm curious for any feedback of people who have done this, or for some reasons why it isn't that good of an idea.

[HeadMed]

I've supplemented with florescent light from the side... But my understanding is the the photo-reaction occurs on the top surface of the leaf, and gas/moisture absorption on the bottom. Light from the bottom could be wasted.

[StonerGrower]

I do it all the time. Ill have a couple CFLs under each plant.

[DrKran]

Check out my grow, I use an HID as main light but CFLs for lower parts of the plant.