didnt have cfl's..4 ft mxed spectrum fluoros.In my experience lighting spectrum does matter, alot. Mr. G is right, genetics obviously play a big role, and as muA said the health of the plant will make a difference too.
I have a particular strain (sensi's superskunk) I've grown it under warmwhite flouros, daylight flouros, cold cathode lights, CMH, and MH. I get different lengths of pistils in different spectrums and intensity. I think it's much more dependant on spectrum rather then intensity.
My SS has been grown under these varied spectrums and intensity, (always in the same soil with the same nutes) and I've noticed the following results.
WW cfl, 100w+ per sq. ft- about 1/2" sized pistils.
daylight cfl, 120w per sq ft- about 1/2" as well.
ccfl (red, white blue colormix) ~25w per sq ft. lonnnng pistils almost an inch. (I have nooo idea what the average spectrum of these mixed colors is/are)
CMH: 400w over 3'x3' area- slightly longer pistils, about 3/4"
MH: 400w over 3'x3' area- about 1/2 " pretty much the same as the cfl's.
You'll see that the longest hairs are on the plants with the lowest wattage, and the shortest hairs are on the plants that actually have the most lumens per sq ft.
I'm not saying that less intensity makes for longer hairs though!! I am saying that the spectrum is responsible. Just mentioning the wattage/lumens per sq ft measurement because I don't personally think that it's responsible for the differences that I'm seeing with this particular strain.
Sorry I don't have high enough quality pics to show the differences clearly, I realllly wish I did though. If you check out my grows (linked in my sig) you might be able to catch a glimpse of what I mean, but it will be pretty blurry.
edit: what spectrum cfls were you running prior to hps? hps is bout the only type of light that I haven't flowered this particular strain under. Ironicly I know tons of growers but no one is using hps! lol!
