I just got a 90W UFO off a guy from Craigslist for $70, a great deal however its just to supplement my 400W HID, FYI: You'll get really good vegetative growth with LED's but unless you have 100 watts of led per sq ft your buds won't be near what an HPS will produce. Don't get me wrong here as LED's will produce fat, sticky, gooey buds, if you have enough LED wattage that is and from what Ive heard you'll need about 100 watts per sq ft to achieve results comparable to HID, this I heard from an experienced, seasoned grower.
I through in a couple pics of my White Widow mother under my 400W HID and 90W LED, she just gave up 15 clones which are in the humidity dome as you can see, today is day 7 and 6 of them have very healthy white tap roots poking out of the jiffy pellets, just a few more days and they'll go into 1 gal pots with a super-soil mix, ooh I'm soooo excited!!!!