I haven't tried them, and I won't be the first to try them, but I'm fascinated by the LEDs. The idea that you can pick and choose which colored LEDs to put in the lamp to mimic the sun and fill in the spectrum the sun produces down to the exact letter makes so much sense. And throw in the ability to ditch some of the fans, all the ACs, the dehumidifiers, the chillers, huge chunks of the electric bill....they are definitely the future, I'm 100% convinced of that and it will be a revolution. Marijuana growing will be forever thought of as pre or post LED. You'll tell your grandkids about growing with a HID and it will seem to them like driving a steam powered car is to us. Yeild? It will eventually be at least doubled as they dial the power of these things in.
Just not quite here yet, but soon...very soon...there is so much money to be made there it won't be denied.