no problem.. there was a great video with all the "scientific" info as well as the testing results, which showed adding UVB light forced the plant to produce more trichomes as a defence mechanism (as UVB is bad for you, and your plant) to protect itself. They also went on to show that the way a trichome works, and they believe it's function includes protecting the plant from these harmful rays. They demonstrated that the trichome's shape and function is related to UVB light defence.
which is why you get frostier buds if you flower with MH over HPS - more UVB light in a MH.
The shape of the trichome is a little dome..imagine a mushroom.. the cap of the mushroom think of as the trichome head. and the stem.. the stem..ok.
if you pull the cap off a mushroom it leaves the stem with like a membrane or segmented part that is naturally there. Much the same membrane is in a trichome.. that's why you get "resin heads" when making hash.. they break off. Light hitting the trichome head is refracted to hit an area of the membrane in the trichome which stimulated the release of THC.
They also proved that the same UVB light destroys THC... but the plant produces more than is destroyed, so you end up with a more potent plant... wish the vid was still up.. would likely make more sense to you...I think there are a few UVB threads in the advanced growing forums.