LED Lights for Cannabis Cultivation – Fohse LED Grow Lights Discover FOHSE'S LED grow light technology for cannabis. Made to optimize your grow operations, our lights ensure maximum yield. Visit us to learn how. Fohse A3i. Designed for unbelievable yields. Patent Pending. PPF PPF: “photosynthetic photon flux” — a measurement of the total amount of PAR emitted by a grow lamp every second. 4,529 μmol/s. Accomplish more with less. An A3i system will require half the number of fixtures to produce the same amount of light as an HPS system. ...