If you belong to the AOS and get Orchids magazine, in the November 2011 issue, Jerry Fischer of Orchids Limited has a detailed discussion of newer LEDs and I have a shorter companion piece, with a few pictures showing LEDs in my indoor plant room.
I think much depends on whether you have the upfront cash to buy the LEDs to get the longer term electricity savings and whether your growing area has excess or deficient heat. The height over the plants matters if you want to grow plants with taller spikes.
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