I tend to grow small plants, SOG size, so I usually don't veg very long. For this experiment I tried to veg as long as possible to maximize any effect that might happen during veg growth. The lighting seemed to work out well for all chambers and got to veg for 6 weeks while maintaining plants of just 10-12".

First general obsevation at the end of vegative stage;
All plants stayed short, compact, node spacing was tight and looked good. But the chamber with UVb looked healthier, the leaves where fatter (we've seen this before) and the amount of leaf growth was a tad more then the other 2 chambers.

At the end of flowering; the chamber that saw UVb from the beginning had the heaviest green wieght, followed by the chamber that had UVb for flowering. The leaves of the UVb/flowering chamber got thicker (like the first experiment I ran) as they progressed. The 2 chambers that used UVb, again just plain "looked" healthier then the no UVb control chamber.

Now the most interesting part, did it (UVb) put more trichomes on the plant? Well yes and no; for the chamber using UVb from the beginning, 3 of the 5 strains showed a remarkable difference in trichome production.
The biggest difference was in the Pure Power Plant, everyone (myself, the fellow doing the work, and my partner from another grow) agreed there was a big difference in the amount of trichomes on these plants. The Shiva Skunk and the Cheese also showed more trics, not as dramatic as PPP but we were all in agreement there was a significant difference from this chamber compared to the other 2 chambers. The White Rhino was more diffucult to call. Since it was sooo frosty even in the controlled chamber, we came up with a split decsion. I felt there was really no improvement, my partner thought there was a slight improvement and the grunt said "I can't tell". We all agreed abt the "apricot", there was no improvement in trichome production.

Chamber #1; UVb for veg/flower: more trichomes on 3 of 5 strains run. The heavyest finished weight. Trichomes went cloudy then amber at finish.

Chamber #2; UVb for flower only: no significant trichome production improvement. Less finished weight then chamber #1, but more then chamber #3. Trichomes went cloudy then amber at finish.

Chamber #3; No UVb: trichomes, well we got what we got. The finished weight was the least of the 3 chambers. Trichomes slowly got cloudy and never went amber. (well I did find 2 ambers on the WR using the "eyeclops")


Well there you have it. The question that I have for myself is, can UVb from the begining, make the same difference in my own grows where I usually just veg for 7-10 days or in aero/fog trays where I go from the clonner to flower tray directly? Guess I just gotta try it and see.

Hope this all makes sense (cents) to everybody. Any questions, please feel free to ask. :thumbsup: