Far-red radiation interacts with relative and absolute blue and red photon flux densities

There has been a rapidly growing interest in far-red radiation for indoor agriculture, but empirical or anecdotal evidence often draws inconsistent conclusions, according to plant scientist William Meng.  "Rightfully so, for one, the usefulness of far-red radiation depends on the relative and absolute amounts of red and blue light." To learn more, here's a free-access link to Meng's latest paper.