EDIT: For Rawbudski:
I thought that a few months ago too,but the LED technology is definitely evolving alot faster than people's attitudes to it
These are the only two problems with investing in LED right now...1. The price is still inflated (but dropping rapidly) for people for whom HID is an option (ie. in cold climates) and 2. The panels are advancing so fast they're being outperformed only a couple of months after you buy it.
But from what Iv seen,current LED tech can dance (true) watt for watt with HID...so viable yet (still a tad) expensive I'd definitely call them now.
And I really mean no offense here,but if you said no to a true 600w LED that was offered for cheaper than a 600w HPS you'd be a straight idiot...no offense again,just it's the only word that would describe a person in that situation. I'm sorry but a 600w LED will match a 600w HPS in yield with only 25% of the heat and there is anecdotal evidence that there is an observable difference in quality with LED due to a wider colour spectrum (red and blue at once) and higher UV.
Not ragging on you man,but you need to get up to date on this tech before judging it,I'm sure someone here would kindly quote me from about 15 pages back before I actually looked into current LED grows...my attitude has changed immensely!
Hope this helps and happy growing bro