I recently did some par testing using a vareity of K/CRI combos. 3000K 70 CRI, 3000K 80 CRI, 3000K 90 CRI, 2700K 90 CRI and 3500K 80 CRI. Surprisingly the 3000K 70 CRI samples provided the most par light and even when weighed against the Mcree curve (which give some advantage to the red range) it still had the best rating. There will be some real world testing to validate the test results, but it will be a very close race.