I don't think my question was understood. I won't have enough UV lamps for all the plants. I need to know at what stage in flower it's going to be most beneficial - i can't do all of them all of flower - not enough bulbs/lamps -- at least for now. The ones that do get them will have them on their full day schedule
Don't wait to use UV-B just in flower. UV-B rays are damaging to plant tissue just as they are to human skin. When a plant is exposed to UV-B light waves throughout it's growth will grow thicker more dense trichomes to protect itself. In simple terms if plants receive UV-B during the vegetative stage of growth they will have more trichomes per square centimeter or millimeter or whatever unit of measurement you can to use. More trichomes will grow to protect more of the plant's surface tissue. Most people see UV-B light waves as just a way to pump up the trichomes they already have at some point in flower, to increase the level of THC in the already existing number of trichomes, and many say do it the last week, the last two weeks or whatever. But that is also why some who have added UV-B lighting to their setups say it doesn't work or it hardly makes any difference. Use it in the vegetative stage of growth and you will then see more trichomes, more as in thicker, denser, more per a given area, than if you do not use UV-B during veg. Then use it all through flower and you will have more trichomes building more THC. It also makes for better leftover plant matter to be used to make bubble hash, or hash in general. There will be more trichomes to collect in the form of hash.
Edited by Brick Top, 25 October 2012 - 12:25 PM.