I'm assuming you guys are all from the States or Canada? In South Africa, chemical acquisition is indeed possible. It's just about who you know and how much that person's price is. ;-)
Anything is possible here with the right connections. I can pick up drivers licenses, Identity documents, work...
Nice info Phil, one thing you didn't mention is that LED's can also be dimmed (lower intensity for clones, higher for veg and flowering).
I'm also working on a 648W custom array 900mm x 900mm with 8100x 80mW LED's that will replace my 400W HPS.
Does anyone know a good colour/white ratio to use?