also if it helps the cola area that turned brown, the cfl light was actually touching it, due to space and size of plants there are several spots where the cfl lights are actually touching the plants I can't set them up any other way or the plants wont get the light spread they need, can cfl's touching the plants damage them as well?
Could be causing your browning, Take a piece of twine and tie the bud down a little just enough to not touch the bulb. If you have nute burn begin flushing them now, it almost sounds like a deficiency though not a burn. Try feeding them some blooming nutes, you should be feeding with every watering to a schedule.