malfist wrote: I am using the "grow light" florescents. They display more of the red spectrum than normal bulbs. Red and Blue colors is what plants use (see: http://www.firstrays.com/Pictures/Chlorophyll.jpg "Chlorophyll Absorption Spectrum of Visible Light"). I also have a couple 1 (or 3?) Watt Cree LED bulbs that emit the correct red wavelength, but they are not in use. Incandescents give of mostly the yellow regions of the spectrum, which aren't useful to plants, however they would give off heat, which may be very much in need. Do you have a link to the experiment?
The reason I don't have the bulbs closer is that the plants range in height considerably.