I can't say anything about the results until I smoke them. I do notice my girls packing on more crystals and smelling pretty pungent, but its due to note that this is normal for 7 weeks into flower with this strain.
On the plus side, The one I'm harvesting in the next 5-6 weeks is a sativa dom. then about 4-6 weeks after that, I'll harvest my indica dom. This will give me a good idea about which type reacts best to the added UVb.
edit: The trigger is very simple, they sell them for home security systems. its a very simple pressure activated switch. a hole must be drilled into the door jam, the switch goes in the hole. When you shut the door the switch is depressed. then just wire in and your done. Be sure to use proper electrical safety when attempting this.