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hmm, good read. It did seem that CALiPER was slightly biased against LED's even as early as the abstract, but their procedures seemed sound enough so I'm going to vote that the bias was rationally derived.
I'm still not sure I agree. As a case study, compare Agmotes LED grow where he used approx 200W of LED power with my CFL grow where I had 250W of CFLs (although only about 100W was on a single plant).