Hey just read ur experiment, and just saw it was in 2007 !!! waow .... so now in 2011 , whats ur conclusion ??
how about in flowering time ?
Through ur post i realised i was using tooo much light : my grow space is a closet : 80 cm deep, 120 cm wide and 180 cm height.
in that tiny space i had placed all CFL lights : 2 big 85W each , and 3 small 48W each , my total is 300 smth . guess thats the reason
why my leafs are all yellow on their tips next to where the light was ( in areas farther from light , all tips are fine).