Got notice of this today. http://www.nightscaping.com/ledfixtures/ How many different lighting manufacturers are now offering LEDs? How do they rate as far as light output goes? How many offer guarantees, and for how long? How do we determine longevity, and is it reflected in price? I've heard that FX and Vista are into their second or third generation of LED offerings... what is going to be available in a year or two years or five? How fast will current LEDs become obsolete? I heard somewhere that Kichler LED fixtures are guaranteed for 15 years...anyone here using them, and how are they working out?